海南岛热带海岸森林土壤易氧化有机碳分布规律及其对土壤因子的响应
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摘要
为了揭示热带海岸森林土壤易氧化有机碳的分布规律,探讨土壤因子对易氧化有机碳的影响,本研究利用高锰酸钾氧化-比色方法测定研究区域内不同林分类型(香蒲桃天然次生林、琼崖海棠天然次生林、椰子人工林、木麻黄人工林、大叶相思人工林)的土壤易氧化有机碳含量,采用简单相关系数法和冗余分析方法评估土壤因子对易氧化有机碳的影响。结果表明:在1 m深剖面内,土壤易氧化有机碳的变化范围为0.60~9.05 g·kg~(-1),各土层间随土壤深度的增加而降低且变化差异显著,均值表现为椰子人工林(4.36 g·kg~(-1))>琼崖海棠天然次生林(3.99 g·kg~(-1))>香蒲桃天然次生林(3.83 g·kg~(-1))>大叶相思人工林(1.29 g·kg~(-1))>木麻黄人工林(0.85 g·kg~(-1))。5种林分类型下,土壤有机碳活度均表现为随土层深度的增加显著降低,在0~20 cm土层,不同林型间均表现为木麻黄人工林>大叶相思人工林>香蒲桃天然次生林>椰子人工林>琼崖海棠天然次生林,说明木麻黄与大叶相思人工林土壤有机碳稳定性较差。EOC的分布受土壤因子(BD、SWC、pH、TN、C/N)的影响,其中,EOC与TN具有最大的正相关性,与BD具有最大的负相关。本研究揭示了海南岛热带海岸不同林地土壤碳库的敏感性和稳定性,研究了不同林分类型土壤EOC和土壤养分的关系,有助于了解热带海岸林地土壤养分状况的供应环境及碳汇响应机理,为评价热带海岸林分类型对土壤碳吸存能力的影响提供基础数据。
This study is aimed to reveal the distribution of soil easily oxidized organic carbon(EOC) in tropical coastal forest,and to evaluate the effect of soil factors on the EOC.The contents of soil easily oxidized organic carbon in five kinds of forests were determined.The name of five kinds of forests are Calophyllum inophyllum natural secondary forest(CIS),Syzygium odoratum natural secondary forest(SOS),Cocos nucifera planted forest(CNP),Acacia auriculiformis planted forest(AAP),Casuarina equisetifolia planted forest(CEP).The results show that:(1)EOC had obvious vertical distribution characteristics,and decreased with the increase of soil depth.EOC also had significant difference in different forest land(CNP > CIS > SOS > AAP > CEP).(2)The activity of soil organic carbon showed a significant decrease with the increase of soil depth.The sort of soil organic carbon activity is: CEP > AAP > SOS >CNP > CIS.(3)The distribution of EOC was affected by soil factors(BD,SWC,PH,TN,C/N),among which,EOC and TN had the biggest positive correlation,and the BD had the biggest negative correlation.This study further shows that the stability of soil organic carbon in tropical coastal forests of Hainan island is relatively low.This study is helpful to understand the soil carbon storage condition and its response mechanism in tropical coastal forest land.
This study is aimed to reveal the distribution of soil easily oxidized organic carbon(EOC) in tropical coastal forest,and to evaluate the effect of soil factors on the EOC.The contents of soil easily oxidized organic carbon in five kinds of forests were determined.The name of five kinds of forests are Calophyllum inophyllum natural secondary forest(CIS),Syzygium odoratum natural secondary forest(SOS),Cocos nucifera planted forest(CNP),Acacia auriculiformis planted forest(AAP),Casuarina equisetifolia planted forest(CEP).The results show that:(1)EOC had obvious vertical distribution characteristics,and decreased with the increase of soil depth.EOC also had significant difference in different forest land(CNP > CIS > SOS > AAP > CEP).(2)The activity of soil organic carbon showed a significant decrease with the increase of soil depth.The sort of soil organic carbon activity is: CEP > AAP > SOS >CNP > CIS.(3)The distribution of EOC was affected by soil factors(BD,SWC,PH,TN,C/N),among which,EOC and TN had the biggest positive correlation,and the BD had the biggest negative correlation.This study further shows that the stability of soil organic carbon in tropical coastal forests of Hainan island is relatively low.This study is helpful to understand the soil carbon storage condition and its response mechanism in tropical coastal forest land.
引文
[1]袁知洋,邓邦良,张学玲,等.武功山草甸植被小群落土壤活性有机碳与土壤养分的典型相关分析[J].中南林业科技大学学报,2016,36(2):84-90.
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[11]陈小花,余雪标,薛杨,等.海南文昌3种林分类型凋落物及土壤有机碳现状分析[J].热带作物学报,2014,35(10):2043-2049.
[12]姜培坤.不同林分下土壤活性有机碳库研究[J].林业科学,2005,41(l):10-13.
[13]吴建国,张小全,徐德应.土地利用变化对土壤有机碳贮量的影响[J].应用生态学报,2004,15(4):593-599.
[14]林晓东,漆智平,唐树梅,等.海南人工地、人工草地土壤易氧化有机碳和轻组碳含量初探[J].热带作物学报,2012,33(1):171-177.
[15]栾军伟.宽坝林区三种林分类型土壤碳形态比较研究[D].雅安:四川农业大学,2007.
[16]李忠武,郭旺,申卫平,等.红壤丘陵区不同地类活性有机碳分布特征及与草本生物量关系[J].湖南大学学报,2013,40(3):76-82.
[17]王淑萍,周广胜,高素华,等.中国东北样带土壤活性有机碳的分布及其对气候变化的响应[J].植物生态学报,2003,27(6):780-785.
[18]赵伟红,康峰峰,韩海荣,等.冀北辽河源地区不同林龄山杨天然次生林土壤理化特征的研究[J].中南林业科技大学学报,2016,36(1):52-57.
[19]张雪,韩士杰,王树起,等.长白山白桦林不同演替阶段土壤有机碳组分的变化[J].生态学杂志,2016,35(2):282-289.
[20]柴华,何念鹏.中国土壤容重特征及其对区域碳贮量估算的意义[J].生态学报,2016,36(13):1-7.
[21]Suuster L,Ritz C,Roostalu,et al.Soil bulk density pedotransfer functions of the humus horizon in arable soils[J].Geoderma,2011,163(1/2):74-82.
[2]兰常军.华西西屏区不同植被类型表层土壤有机碳组分特征[D].雅安:四川农业大学,2013.
[3]徐侠,王丰,栾以玲,等.武夷山不同海拔植被土壤易氧化碳[J].生态学杂志,2008,27(7):1115-1121.
[4]Biederbeck V O,Janzen H H,Campbell C A,et al.Labile soil organic matter as influenced by cropping practices in anarid environment[J].Soil Biology and Biochemistry,1994,26(12):1647-1656.
[5]徐秋芳,姜培坤,沈泉.灌木林与阔叶林土壤有机碳库的比较研究[J].北京林业大学学报,2005,27(2):18-22.
[6]朱志建,姜培坤,徐秋芳,等.不同森林植被下土壤微生物量碳和易氧化态碳的比较[J].林业科学研究,2006,19(4):523-526.
[7]姜霞,王进,李丛瑞,等.黔中地区三种林分土壤有机碳库比较[J].湖北农业科学,2013,52(6):1270-1272,1276.
[8]贾重建,刘红宜,卢瑛,等.土地利用方式对土壤有机碳和团聚体组分特征的影响[J].热带地理,2014,34(5):681-689.
[9]张俊华,丁维新,孟磊.海南热带橡胶园土壤易氧化有机碳空间变异特征研究[J].生态环境学报,2010,19(11):2563-2567.
[10]董扬红,曾全超,安韶山,等.黄土高原不同林型植被对土壤活性有机碳及腐殖质的影响[J].水土保持学报,2015,29(1):143-148.
[11]陈小花,余雪标,薛杨,等.海南文昌3种林分类型凋落物及土壤有机碳现状分析[J].热带作物学报,2014,35(10):2043-2049.
[12]姜培坤.不同林分下土壤活性有机碳库研究[J].林业科学,2005,41(l):10-13.
[13]吴建国,张小全,徐德应.土地利用变化对土壤有机碳贮量的影响[J].应用生态学报,2004,15(4):593-599.
[14]林晓东,漆智平,唐树梅,等.海南人工地、人工草地土壤易氧化有机碳和轻组碳含量初探[J].热带作物学报,2012,33(1):171-177.
[15]栾军伟.宽坝林区三种林分类型土壤碳形态比较研究[D].雅安:四川农业大学,2007.
[16]李忠武,郭旺,申卫平,等.红壤丘陵区不同地类活性有机碳分布特征及与草本生物量关系[J].湖南大学学报,2013,40(3):76-82.
[17]王淑萍,周广胜,高素华,等.中国东北样带土壤活性有机碳的分布及其对气候变化的响应[J].植物生态学报,2003,27(6):780-785.
[18]赵伟红,康峰峰,韩海荣,等.冀北辽河源地区不同林龄山杨天然次生林土壤理化特征的研究[J].中南林业科技大学学报,2016,36(1):52-57.
[19]张雪,韩士杰,王树起,等.长白山白桦林不同演替阶段土壤有机碳组分的变化[J].生态学杂志,2016,35(2):282-289.
[20]柴华,何念鹏.中国土壤容重特征及其对区域碳贮量估算的意义[J].生态学报,2016,36(13):1-7.
[21]Suuster L,Ritz C,Roostalu,et al.Soil bulk density pedotransfer functions of the humus horizon in arable soils[J].Geoderma,2011,163(1/2):74-82.