Shanmughavel P, Sha L, Zheng Z, Cao M
Department of Forest Ecology, XTBG, The Chinese Academy of Sciences, Kunming.
Bioresour Technol. 2001 Dec;80(3):163-70. doi: 10.1016/s0960-8524(01)00095-5.
Tropical rain forests are characterized by large numbers of the species with diverse growth habits. The objective of the present study was to determine the distribution of nutrient content in the major trees of the tropical rain forests in Xishuangbanna. This will improve the understanding of the nutrient losses from such sites that result from harvesting and flow of nutrients within the ecosystem and lead to the development of effective and rational forest management strategies. Based on the results in this study, the distribution of nutrients among biomass components of trees varied: The ordering of major elements concentrations was K > N > Mg > Ca > P in branch, stem and root tissues but was N > K > Mg > Ca > P in leaves. The maximum amount of all nutrients per ha occurred in the stems followed by branches, roots and leaves. Of the total uptake of 6167.7 kg ha(-1) of all nutrients, the contribution of various nutrients was found to be N (2010.6 t ha(-1)), P (196.3 t ha(-1)), K (2123.8 kg ha(-1)), Ca (832 kg ha(-1)) and Mg (1005 kg ha(-1)). However, comparing the nutrient uptake of other tropical and sub tropical forests, the results indicated that rates for the Xishuangbanna forests were 20-35% lower than previously reported values.
热带雨林的特点是有大量具有不同生长习性的物种。本研究的目的是确定西双版纳热带雨林主要树木中养分含量的分布情况。这将增进对因采伐导致的此类林地养分流失以及生态系统内养分流动的理解，并有助于制定有效且合理的森林管理策略。基于本研究结果，树木生物量各组分间的养分分布各异：在树枝、树干和根系组织中，主要元素浓度的排序为钾＞氮＞镁＞钙＞磷，而在树叶中则为氮＞钾＞镁＞钙＞磷。每公顷所有养分的最大含量出现在树干中，其次是树枝、根系和树叶。在所有养分6167.7千克/公顷的总吸收量中，各种养分的贡献分别为：氮（2010.6千克/公顷）、磷（196.3千克/公顷）、钾（2123.8千克/公顷）、钙（832千克/公顷）和镁（1005千克/公顷）。然而，与其他热带和亚热带森林的养分吸收情况相比，结果表明西双版纳森林的吸收率比先前报道的值低20 - 35%。
