高寒沙地不同林龄乌柳人工防护林固碳功能
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摘要
植被恢复与重建是防治土地荒漠化的有效方式。人工固沙植被具有多种生态服务功能。其中，固碳功能是生态系统的一个非常重要的服务功能。本研究以典型的高寒沙地生态系统为主要研究对象，对乌柳防护林的土壤理化性质、根系分布特征、生物量、生产力以及生态系统碳贮量等方面进行了研究，旨在探讨乌柳防护林的生物和土壤固碳功能及其影响因子，为全面评价高寒沙地生态系统的固碳功能提供科学依据。本研究可以为今后在共和盆地以及其他干旱、半干旱区退化生态系统开展植被恢复与重建，评价生态系统的服务功能提供参考。主要结果如下：
（1）不同林龄乌柳林的土壤理化性质
乌柳林土壤有机质含量随恢复时间的增长不断增加。恢复年限对不同林龄土壤有机质有显著影响（P<0.05），且同一林龄不同深度差异不同。土壤全氮含量随恢复时间的增加而增加，具体表现为21a>16a>11a>6a>ck。土壤表层与深层土壤有机质与全氮含量都发生了显著的变化，上层土壤（深度<100cm）高于下层。土壤铵态氮和硝态氮的含量在各林龄之间差异显著，土壤速效磷和土壤速效钾含量随恢复时间的增长逐渐增加，土壤pH值逐渐降低。因此，乌柳林的建设有利于土壤的固定和改良，随恢复时间的增长，植被对土壤的改良作用逐渐增强。
不同林龄乌柳林林下土壤含水量变化总体差异显著（P<0.05），且同一林龄不同深度之间差异不同。各林龄10~20cm和20~30cm深度土壤含水量优于土壤表层。21a乌柳林生长发育较为成熟，土壤有机质含量较高，土壤孔隙度高，蓄水能力和持水能力较强，土壤水分状况最好。随恢复时间的增加，各林龄土壤容重逐渐减小，土壤孔隙度、土壤毛管孔隙度、土壤毛管持水量与最大持水量逐渐增加。乌柳林土壤结构和孔性得到了有效改善，根系与土壤之间的交互作用导致土壤容重的改变，进而导致土壤有机碳含量的变化。
（2）不同林龄乌柳林的生物量与生产力
各林龄乌柳林生物量逐渐增加，6a、11a、16a和21a分别为10.58t hm~(-2)、19.49t hm~(-2)、28.90t hm~(-2)和41.27t hm~(-2)。各组分生物量的分配表现各异，在数值上的大小关系可表示为：树干>树根>树枝>树叶>树皮。采用一元方程模型即以基径（B）为自变量进行生物量的推算是较为合理的方法。
不同林龄乌柳林根系主要由直径小于5.0mm的中根和细根构成，以直径小于2.0mm的细根所占比例最高。各林龄乌柳根系在0~50cm分布较为集中，6a乌柳林根系分布在0~130cm之间，21a乌柳林根系可达地下200cm，各林龄根系生物量随恢复时间的增长逐渐增加，比根长与根长密度显著增加。随林龄的增加，根系消根系数逐渐增加。乌柳表现出深根性的特点，体现出较强的生态可塑性。植被恢复对深层土壤有机质的变化影响亦显著（P<0.05）。比根长和根长密度的增加导致了土壤容重的变化。土壤有机质的变化与根系生长及分布有着极显著的相关性（P<0.01）。各林龄乌柳防护林平均净生产力依次为1.76、1.78、1.81和1.97t hm~(-2) a~(-1)。草本层生物量占整个生态系统的比例逐渐降低。各组分年平均净生产力大小顺序均为树干>树根>树枝>树叶>树皮。
（3）不同林龄乌柳林的碳密度和碳贮量
随着林龄的增加，乌柳各组分碳密度变化规律并不显著。各林龄乌柳根系碳密度之间未达到显著水平。6a乌柳各器官碳密度变化范围为0.4105~0.5087gC g~(-1)，11a乌柳各器官碳密度变化范围为0.4523~0.5342gC g~(-1)，16a乌柳各器官碳密度变化范围为0.4514~0.5485gC g~(-1)，21a乌柳各器官碳密度变化范围为0.4704~0.5992gC g~(-1)。不同林龄乌柳的粗根、中根、细根的碳密度变化规律不一致。各林龄乌柳林碳贮量分别为4.95t hm~(-2)、9.93t hm~(-2)、14.67t hm~(-2)和21.99t hm~(-2)。不同林龄乌柳不同组分碳库的分配比例不一致，树干碳贮量占林分碳贮量的百分比最高。
同一深度不同林龄乌柳土壤有机碳含量总体差异显著（P<0.05）。土壤碳库随植被恢复时间的增加而增加，较之6a，11a土壤碳库增加26.78%，16a较之11a提高24.16%，21a较16a提高9.82%。土壤有机碳含量与土壤容重之间呈极显著负相关关系（P<0.01），与土壤全氮呈极显著正相关关系（P<0.01）。以土壤有机碳为相应变量，分别建立三维模型以及线性归回方程，模拟土壤有机碳随林龄与容重、深度与容重、全氮与容重的空间变化，为区域甚至大尺度的土壤碳库模型的建立提供了思路。
不同林龄乌柳防护林的生态系统碳库分别为14.76t hm~(-2)、23.25t hm~(-2)、32.18t hm~(-2)和41.48t hm~(-2)。土壤碳库（0~(-2)00cm）分别为9.54t hm~(-2)、13.03t hm~(-2)、17.18t hm~(-2)和19.05t hm~(-2)。较之恢复前（ck），各林龄碳库分别增加57.05%、36.52%、27.75%和22.42%。植被恢复区乌柳造林总面积为223.2hm~(-2)，按照各林龄碳贮量的平均值即12.795t hm~(-2)进行计算，则植被恢复区乌柳林固碳量为2855.844Mg C。建立乌柳林各组分生物量与碳贮量的回归方程，为今后通过实测生物量计算各组分碳贮量提供了依据。各林龄生态系统的净生产力分别为1.76t hm~(-2) a~(-1)、1.78t hm~(-2) a~(-1)、1.81t hm~(-2) a~(-1)和1.97t hm~(-2) a~(-1)。各林龄年均固碳量分别为0.83t hm~(-2) a~(-1)、0.90t hm~(-2) a~(-1)、0.92t hm~(-2) a~(-1)和1.05t hm~(-2) a~(-1)。不同林龄乌柳各器官的固碳量均以树干最高。各林龄乌柳林年净固碳量随林龄的增加逐渐增加。乌柳防护林具有“碳汇”功能。
Revegetation and restoration is the effective measure to prevent and control desertification.Moreover, the sand-fixing vegetaions have multiple ecosystem services and the carbonsequestration is one of the most important ecosystem service. In this research, the typicalhigh-cold sandland ecosystem in the Gonghe Basin, Qinghai Province was used to study thesoil physical and chemical properties, the characteristics of root distribution, the plantationbiomass and productivity, the carbon storage of ecosystem. The aim of this study is to researchthe characteristic of carbon sequestration and its effect factor about the Salix cheilophila shelterbelt, and providing a scientific basis for a comprehensive evaluation of the carbonsequestration in high-cold sand land ecosystem. Besides, it could also be benefits to providereference for the vegetation restoration and protection, revegetation in degraded ecosystem andthe assessment of ecosystem services in sandy land in arid and semi-arid ecosystems in thefuture. The main results are as follows:(1) Soil chemical and physical properties of Salix cheilophila plantation with different age
The contents of soil organic matter (SOM) showed significantly increment with theextension of restoration time of S. cheilophila plantations (P<0.05). Soil organic matter contentwas affected significantly by restoration time and soil depths (P<0.05). The contents of totalnitrogen (TN) showed significantly increment with the extension of restoration time, thespecific data is21a>16a>11a>6a>ck. SOM and TN changed not only in the subsoil but also inthe deep soil layer. The content of the soil NO3-N, NH4-N, AP (available phosphorus) and AK(available potassium) showed significant differences in different ages of S.cheilophilaplantation (P<0.05). In the same stand age, soil nutrients contents of the upper soil layer(depth<100cm) were higher than deeper soil. The content of AP and AK increased, and soil pHvalues decreased gradually with restoration time. The soil chemical properties and soil fertilitylevels were improved gradually after the establishment of S. cheilophila plantation.
The soil water content exhibited significant difference (P<0.05) among different stand ages in general, and marked differences were also found among different soil depth. The soilwater content in10~20cm and20~30cm were superior to the surface (0~10cm). The soilwater condition was the best in21-years old. S. cheilophila plantation, which showed higherSOM and soil porosity relatively, with better water holding capacity. With longer restorationtime, the soil bulk density decreased gradually; on the contrary, the soil porosity, soil capillaryporosity, soil capillary holding capacity and maximum water holding capacity increased. Thesoil structure and porosity properties of S.cheilophila were improved effectively. Theinteractions between root and soil led to the change of soil bulk density, which caused thechange of soil organic carbon storage.(2) The biomass and productivity of Salix cheilophila plantation with different ages
The biomass of the S. cheilophila plantation increased gradually with ages. Biomass of6,11,16,21-years-old plantation were10.58,19.49,28.90and41.27t hm~(-2)respectively. Thebiomass allocation of each component was different. On the numerical side, it could beexpressed as: the trunk> root> branches> leaves> bark. The Single-Equation Model was areasonable way to evaluate the biomass and the basal diameter (B) was used as the independentvariable.
The root system of S. cheilophila with different plantation ages was mainly consist of fineroots and middle roots with diameter less than5.0mm, among which more than50%were fineroots with diameter less than2.0mm. The root system of S.cheilophila plantation wasconcentratedly distributed in soil depth of0~50cm. The root system of6-years-old wasdistributed in0~130cm, and the vertical distribution of21-years-old could reach200cm. Theroot biomass increased gradually with revegetation time. Besides, root specific length and rootlength density also showed significant increment (P<0.05). The root extinction coefficientgradually increased with stand age. S. cheilophila showed the characteristics of deep-root,which reflected excellent ecological plasticity. Revegetation also showed significant influenceto the change of SOM. The increment of root specific length and root length density lead tochange of soil bulk density. There was highly significant correlation between soil organicmatter and root distribution. The net ecosystem productivity of the S. cheilophila of6,11,16, 21years old plantation were1.76,1.78,1.81and1.97t hm~(-2) a~(-1)respectively. The proportion ofbiomass in the herb layer was gradually reduced in the entire ecosystem. And the productivityof each component could be arranged in numerical size, as the trunk> root> branches>foliage> bark.(3) The carbon density and carbon storage of Salix cheilophila plantation with different ages
There is no significant difference of carbon density variation between each componentwith the increment of restoration time (P>0.05). The carbon density of root did not reach asignificant level in any age of plantation. The range of variation in carbon density in differentorgans was0.4105~0.5087gC g~(-1)for6-years-old plantation,0.4523~0.5342gC g~(-1)for11-years-old plantation,0.4514~0.5485gC g~(-1)for16-years-old plantation, and0.4704~0.5992gC g~(-1)for21-years-old plantation. The variation of carbon density in the coarse root, middleroot and fine root was different in different stand ages. The carbon storage of6,11,16, and21-years-old was10.58,19.49,28.90and41.27t hm~(-2)respectively. The proportion of carbonpools of different components differed in different stand ages. The carbon storage in the trunktook up the highest percentage in all components.
The soil organic carbon pools showed significant difference in the same depth of differentages (P<0.05). The soil carbon pools increased with the restoration time, the soil carbon poolsof11-year-old plantation increased26.78%compared to the6-years-old, the16-years-oldplantation increased24.16%compared to the11-years, and the21-year increased9.82%compared to the16-years-old. The contents of soil organic carbon and soil bulk density showedhighly significant negative correlation (P<0.01). On the contrary, positive correlation showedbetween the contents of soil organic carbon and the contents of TN. Take soil organic carbon asdependent variables, the three-dimensional model and linear equation were set up to simulatethe changes among the soil organic carbon, soil bulk density, soil depth and total nitrogen withthe extension of the restoration time, respectively. Regression models showed that the soil bulkdensity, soil total nitrogen significantly effect on the soil organic carbon (P<0.01), whichprovided thoughts for the modeling of soil carbon pool in the vegetation restoration area on theregional and even large-scale.
The ecosystem carbon pools of the S.cheilophila of6,11,16and21-years-old were14.76,23.25,32.18and41.48t hm~(-2)respectively. And the soil carbon pools were9.54,13.03,17.18,19.05t hm~(-2). The carbon pools increased57.05%、36.52%、27.75%and22.42%compared toCK, respectively. The total area of the Salix cheilophila in the restoration area is223.2hm~(-2),calculated with the average of the carbon storage (12.795t hm~(-2)), the carbon sequestration ofthe S. cheilophila in the restoration area reached2855.844Mg C. The establishment ofregression equation of biomass and carbon storage of each component provided basis tomeasure the carbon storage according to biomass in the future. The net primary productivity ofthe S. cheilophila plantation of6,11,16,21-years-old was1.76,1.78,1.81and1.97t hm~(-2), theaverage annual carbon sequestration of each stand was0.83,0.90,0.92and1.05t hm~(-2) a~(-1). Thetrunk has the highest carbon sequestration. The net carbon storage increased with therestoration time. The artificial shelterbelt of S. cheilophila plantation could be considered as a“carbon sink”.
（1）不同林龄乌柳林的土壤理化性质
乌柳林土壤有机质含量随恢复时间的增长不断增加。恢复年限对不同林龄土壤有机质有显著影响（P<0.05），且同一林龄不同深度差异不同。土壤全氮含量随恢复时间的增加而增加，具体表现为21a>16a>11a>6a>ck。土壤表层与深层土壤有机质与全氮含量都发生了显著的变化，上层土壤（深度<100cm）高于下层。土壤铵态氮和硝态氮的含量在各林龄之间差异显著，土壤速效磷和土壤速效钾含量随恢复时间的增长逐渐增加，土壤pH值逐渐降低。因此，乌柳林的建设有利于土壤的固定和改良，随恢复时间的增长，植被对土壤的改良作用逐渐增强。
不同林龄乌柳林林下土壤含水量变化总体差异显著（P<0.05），且同一林龄不同深度之间差异不同。各林龄10~20cm和20~30cm深度土壤含水量优于土壤表层。21a乌柳林生长发育较为成熟，土壤有机质含量较高，土壤孔隙度高，蓄水能力和持水能力较强，土壤水分状况最好。随恢复时间的增加，各林龄土壤容重逐渐减小，土壤孔隙度、土壤毛管孔隙度、土壤毛管持水量与最大持水量逐渐增加。乌柳林土壤结构和孔性得到了有效改善，根系与土壤之间的交互作用导致土壤容重的改变，进而导致土壤有机碳含量的变化。
（2）不同林龄乌柳林的生物量与生产力
各林龄乌柳林生物量逐渐增加，6a、11a、16a和21a分别为10.58t hm~(-2)、19.49t hm~(-2)、28.90t hm~(-2)和41.27t hm~(-2)。各组分生物量的分配表现各异，在数值上的大小关系可表示为：树干>树根>树枝>树叶>树皮。采用一元方程模型即以基径（B）为自变量进行生物量的推算是较为合理的方法。
不同林龄乌柳林根系主要由直径小于5.0mm的中根和细根构成，以直径小于2.0mm的细根所占比例最高。各林龄乌柳根系在0~50cm分布较为集中，6a乌柳林根系分布在0~130cm之间，21a乌柳林根系可达地下200cm，各林龄根系生物量随恢复时间的增长逐渐增加，比根长与根长密度显著增加。随林龄的增加，根系消根系数逐渐增加。乌柳表现出深根性的特点，体现出较强的生态可塑性。植被恢复对深层土壤有机质的变化影响亦显著（P<0.05）。比根长和根长密度的增加导致了土壤容重的变化。土壤有机质的变化与根系生长及分布有着极显著的相关性（P<0.01）。各林龄乌柳防护林平均净生产力依次为1.76、1.78、1.81和1.97t hm~(-2) a~(-1)。草本层生物量占整个生态系统的比例逐渐降低。各组分年平均净生产力大小顺序均为树干>树根>树枝>树叶>树皮。
（3）不同林龄乌柳林的碳密度和碳贮量
随着林龄的增加，乌柳各组分碳密度变化规律并不显著。各林龄乌柳根系碳密度之间未达到显著水平。6a乌柳各器官碳密度变化范围为0.4105~0.5087gC g~(-1)，11a乌柳各器官碳密度变化范围为0.4523~0.5342gC g~(-1)，16a乌柳各器官碳密度变化范围为0.4514~0.5485gC g~(-1)，21a乌柳各器官碳密度变化范围为0.4704~0.5992gC g~(-1)。不同林龄乌柳的粗根、中根、细根的碳密度变化规律不一致。各林龄乌柳林碳贮量分别为4.95t hm~(-2)、9.93t hm~(-2)、14.67t hm~(-2)和21.99t hm~(-2)。不同林龄乌柳不同组分碳库的分配比例不一致，树干碳贮量占林分碳贮量的百分比最高。
同一深度不同林龄乌柳土壤有机碳含量总体差异显著（P<0.05）。土壤碳库随植被恢复时间的增加而增加，较之6a，11a土壤碳库增加26.78%，16a较之11a提高24.16%，21a较16a提高9.82%。土壤有机碳含量与土壤容重之间呈极显著负相关关系（P<0.01），与土壤全氮呈极显著正相关关系（P<0.01）。以土壤有机碳为相应变量，分别建立三维模型以及线性归回方程，模拟土壤有机碳随林龄与容重、深度与容重、全氮与容重的空间变化，为区域甚至大尺度的土壤碳库模型的建立提供了思路。
不同林龄乌柳防护林的生态系统碳库分别为14.76t hm~(-2)、23.25t hm~(-2)、32.18t hm~(-2)和41.48t hm~(-2)。土壤碳库（0~(-2)00cm）分别为9.54t hm~(-2)、13.03t hm~(-2)、17.18t hm~(-2)和19.05t hm~(-2)。较之恢复前（ck），各林龄碳库分别增加57.05%、36.52%、27.75%和22.42%。植被恢复区乌柳造林总面积为223.2hm~(-2)，按照各林龄碳贮量的平均值即12.795t hm~(-2)进行计算，则植被恢复区乌柳林固碳量为2855.844Mg C。建立乌柳林各组分生物量与碳贮量的回归方程，为今后通过实测生物量计算各组分碳贮量提供了依据。各林龄生态系统的净生产力分别为1.76t hm~(-2) a~(-1)、1.78t hm~(-2) a~(-1)、1.81t hm~(-2) a~(-1)和1.97t hm~(-2) a~(-1)。各林龄年均固碳量分别为0.83t hm~(-2) a~(-1)、0.90t hm~(-2) a~(-1)、0.92t hm~(-2) a~(-1)和1.05t hm~(-2) a~(-1)。不同林龄乌柳各器官的固碳量均以树干最高。各林龄乌柳林年净固碳量随林龄的增加逐渐增加。乌柳防护林具有“碳汇”功能。
Revegetation and restoration is the effective measure to prevent and control desertification.Moreover, the sand-fixing vegetaions have multiple ecosystem services and the carbonsequestration is one of the most important ecosystem service. In this research, the typicalhigh-cold sandland ecosystem in the Gonghe Basin, Qinghai Province was used to study thesoil physical and chemical properties, the characteristics of root distribution, the plantationbiomass and productivity, the carbon storage of ecosystem. The aim of this study is to researchthe characteristic of carbon sequestration and its effect factor about the Salix cheilophila shelterbelt, and providing a scientific basis for a comprehensive evaluation of the carbonsequestration in high-cold sand land ecosystem. Besides, it could also be benefits to providereference for the vegetation restoration and protection, revegetation in degraded ecosystem andthe assessment of ecosystem services in sandy land in arid and semi-arid ecosystems in thefuture. The main results are as follows:(1) Soil chemical and physical properties of Salix cheilophila plantation with different age
The contents of soil organic matter (SOM) showed significantly increment with theextension of restoration time of S. cheilophila plantations (P<0.05). Soil organic matter contentwas affected significantly by restoration time and soil depths (P<0.05). The contents of totalnitrogen (TN) showed significantly increment with the extension of restoration time, thespecific data is21a>16a>11a>6a>ck. SOM and TN changed not only in the subsoil but also inthe deep soil layer. The content of the soil NO3-N, NH4-N, AP (available phosphorus) and AK(available potassium) showed significant differences in different ages of S.cheilophilaplantation (P<0.05). In the same stand age, soil nutrients contents of the upper soil layer(depth<100cm) were higher than deeper soil. The content of AP and AK increased, and soil pHvalues decreased gradually with restoration time. The soil chemical properties and soil fertilitylevels were improved gradually after the establishment of S. cheilophila plantation.
The soil water content exhibited significant difference (P<0.05) among different stand ages in general, and marked differences were also found among different soil depth. The soilwater content in10~20cm and20~30cm were superior to the surface (0~10cm). The soilwater condition was the best in21-years old. S. cheilophila plantation, which showed higherSOM and soil porosity relatively, with better water holding capacity. With longer restorationtime, the soil bulk density decreased gradually; on the contrary, the soil porosity, soil capillaryporosity, soil capillary holding capacity and maximum water holding capacity increased. Thesoil structure and porosity properties of S.cheilophila were improved effectively. Theinteractions between root and soil led to the change of soil bulk density, which caused thechange of soil organic carbon storage.(2) The biomass and productivity of Salix cheilophila plantation with different ages
The biomass of the S. cheilophila plantation increased gradually with ages. Biomass of6,11,16,21-years-old plantation were10.58,19.49,28.90and41.27t hm~(-2)respectively. Thebiomass allocation of each component was different. On the numerical side, it could beexpressed as: the trunk> root> branches> leaves> bark. The Single-Equation Model was areasonable way to evaluate the biomass and the basal diameter (B) was used as the independentvariable.
The root system of S. cheilophila with different plantation ages was mainly consist of fineroots and middle roots with diameter less than5.0mm, among which more than50%were fineroots with diameter less than2.0mm. The root system of S.cheilophila plantation wasconcentratedly distributed in soil depth of0~50cm. The root system of6-years-old wasdistributed in0~130cm, and the vertical distribution of21-years-old could reach200cm. Theroot biomass increased gradually with revegetation time. Besides, root specific length and rootlength density also showed significant increment (P<0.05). The root extinction coefficientgradually increased with stand age. S. cheilophila showed the characteristics of deep-root,which reflected excellent ecological plasticity. Revegetation also showed significant influenceto the change of SOM. The increment of root specific length and root length density lead tochange of soil bulk density. There was highly significant correlation between soil organicmatter and root distribution. The net ecosystem productivity of the S. cheilophila of6,11,16, 21years old plantation were1.76,1.78,1.81and1.97t hm~(-2) a~(-1)respectively. The proportion ofbiomass in the herb layer was gradually reduced in the entire ecosystem. And the productivityof each component could be arranged in numerical size, as the trunk> root> branches>foliage> bark.(3) The carbon density and carbon storage of Salix cheilophila plantation with different ages
There is no significant difference of carbon density variation between each componentwith the increment of restoration time (P>0.05). The carbon density of root did not reach asignificant level in any age of plantation. The range of variation in carbon density in differentorgans was0.4105~0.5087gC g~(-1)for6-years-old plantation,0.4523~0.5342gC g~(-1)for11-years-old plantation,0.4514~0.5485gC g~(-1)for16-years-old plantation, and0.4704~0.5992gC g~(-1)for21-years-old plantation. The variation of carbon density in the coarse root, middleroot and fine root was different in different stand ages. The carbon storage of6,11,16, and21-years-old was10.58,19.49,28.90and41.27t hm~(-2)respectively. The proportion of carbonpools of different components differed in different stand ages. The carbon storage in the trunktook up the highest percentage in all components.
The soil organic carbon pools showed significant difference in the same depth of differentages (P<0.05). The soil carbon pools increased with the restoration time, the soil carbon poolsof11-year-old plantation increased26.78%compared to the6-years-old, the16-years-oldplantation increased24.16%compared to the11-years, and the21-year increased9.82%compared to the16-years-old. The contents of soil organic carbon and soil bulk density showedhighly significant negative correlation (P<0.01). On the contrary, positive correlation showedbetween the contents of soil organic carbon and the contents of TN. Take soil organic carbon asdependent variables, the three-dimensional model and linear equation were set up to simulatethe changes among the soil organic carbon, soil bulk density, soil depth and total nitrogen withthe extension of the restoration time, respectively. Regression models showed that the soil bulkdensity, soil total nitrogen significantly effect on the soil organic carbon (P<0.01), whichprovided thoughts for the modeling of soil carbon pool in the vegetation restoration area on theregional and even large-scale.
The ecosystem carbon pools of the S.cheilophila of6,11,16and21-years-old were14.76,23.25,32.18and41.48t hm~(-2)respectively. And the soil carbon pools were9.54,13.03,17.18,19.05t hm~(-2). The carbon pools increased57.05%、36.52%、27.75%and22.42%compared toCK, respectively. The total area of the Salix cheilophila in the restoration area is223.2hm~(-2),calculated with the average of the carbon storage (12.795t hm~(-2)), the carbon sequestration ofthe S. cheilophila in the restoration area reached2855.844Mg C. The establishment ofregression equation of biomass and carbon storage of each component provided basis tomeasure the carbon storage according to biomass in the future. The net primary productivity ofthe S. cheilophila plantation of6,11,16,21-years-old was1.76,1.78,1.81and1.97t hm~(-2), theaverage annual carbon sequestration of each stand was0.83,0.90,0.92and1.05t hm~(-2) a~(-1). Thetrunk has the highest carbon sequestration. The net carbon storage increased with therestoration time. The artificial shelterbelt of S. cheilophila plantation could be considered as a“carbon sink”.
引文
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