韶关市小坑林场山杜英林N和P储量及分配格局
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摘要
对韶关市小坑林场山杜英人工林的N和P含量、储量及其分配格局进行了研究,以便为山杜英人工林的养分循环和科学经营提供依据。采用标准样地法,对样地内的乔木层按照叶、枝、干和根取样,灌木层和草本层分地上和地下部分取样,凋落物层用样方法取样。各组分的样品各取300 g,带回实验室分析研究。结果表明:1)山杜英人工林乔木层各组分的氮和磷含量为叶片>树枝>树根>树干,人工林垂直结构的氮含量呈现凋落物层>草本层>灌木层>乔木层,而磷含量为灌木层>凋落物层>草本层>乔木层。2)山杜英人工林养分储量为0.25 t/hm~2,其中乔木层、灌木层、草本层和凋落物层的养分储量分别为0.149、0.012、0.046和0.049 t/hm~2,分别占林分养分储量的58.2%、4.7%、18.0%和19.1%。3)乔木层各器官营养元素含量排序为叶>枝>根>干,储量为枝>干>根>叶。4)山杜英乔木层的C/N、C/P、N/P分别为52.86、688.80和13.03。
The contents, storage and distribution patterns of N and P contents in an Elaeocarpus sylvestris stand in Xiaoken Forest Farm Shaoguan City, Guangdong Province were investigated and studied to provide a basis for nutrient cycling and scienti?c management of the E.sylvestris plantation. With standard sampling method, samples were collected from leaves, branches, stem and roots of tree layer,aboveground and underground parts of shrub and herb layers, litter of ?ve small quadrats at three plots. Samples of each component were taken 300 g each and brought back to the laboratory for analysis. The results show that 1) N and P contents of tree layer in the E.sylvestris stand decreased in the order of leaves > branches > roots > stem; Among the vertical structural components, N content decreased in the order of litter layer > herb layer > shrub layer > tree layer, whereas P content decreased in the order of shrub layer> litter layer > herb layer > tree layer. 2) The total nutrient storage in the E. sylvestris stand was 0.256 t/hm~2, and the nutrient storage values of the tree layer, herb layer, shrub layer and litter layer were 0.149, 0.012, 0.046 and 0.049 t/hm~2, respectively, accounting for 58.2%, 4.7%, 18.0% and 19.1% of the total nutrient storage. 3) The nutrient content of tree layer in various organs decreased in the order of leaves > branches > roots > stem and nutrient storage decreased in the order of branches > stem > roots > leaves. The C/N, C/P and N/P ratios in the tree layer of the E. sylvestris were 52.86, 688.80 and 13.03, respectively.
The contents, storage and distribution patterns of N and P contents in an Elaeocarpus sylvestris stand in Xiaoken Forest Farm Shaoguan City, Guangdong Province were investigated and studied to provide a basis for nutrient cycling and scienti?c management of the E.sylvestris plantation. With standard sampling method, samples were collected from leaves, branches, stem and roots of tree layer,aboveground and underground parts of shrub and herb layers, litter of ?ve small quadrats at three plots. Samples of each component were taken 300 g each and brought back to the laboratory for analysis. The results show that 1) N and P contents of tree layer in the E.sylvestris stand decreased in the order of leaves > branches > roots > stem; Among the vertical structural components, N content decreased in the order of litter layer > herb layer > shrub layer > tree layer, whereas P content decreased in the order of shrub layer> litter layer > herb layer > tree layer. 2) The total nutrient storage in the E. sylvestris stand was 0.256 t/hm~2, and the nutrient storage values of the tree layer, herb layer, shrub layer and litter layer were 0.149, 0.012, 0.046 and 0.049 t/hm~2, respectively, accounting for 58.2%, 4.7%, 18.0% and 19.1% of the total nutrient storage. 3) The nutrient content of tree layer in various organs decreased in the order of leaves > branches > roots > stem and nutrient storage decreased in the order of branches > stem > roots > leaves. The C/N, C/P and N/P ratios in the tree layer of the E. sylvestris were 52.86, 688.80 and 13.03, respectively.
引文
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[20]莫江明,彭少麟,BROWN S,等.鼎湖山马尾松林植物养分积累动态及其对人为干扰的响应[J].植物生态学报,2004,28(6):810-822.
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[22]陈振华,李远航,杨卫星,等.米老排人工林营养元素积累及其分配格局[J].林业工程学报,2015,29(2):133-136.
[23]吴庆标,宋华萍,朱媛.广西32年生顶果木林分营养元素积累与分配特征[J].西部林业科学,2015(5):39-44.
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[30]俞月凤,何铁光,彭晚霞,等.喀斯特峰丛洼地不同类型森林养分循环特征[J].生态学报,2015,35(22):7531-7542.
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