水保所知识产出(1956---)知识库

为研究不同管理措施(凋落物去除、油松幼林、灌木和草地)下土壤水溶性碳、氮含量的变化以及土壤溶解性有机质
(SDOM)的组分，选取黄土高原油松人工林为研究对象，以未皆伐油松人工林作为对照，对土壤水溶性碳、氮以及 SDOM 荧光
组分等相关重要特征量进行研究分析． 结果表明，灌木和油松幼林的土壤水溶性有机碳含量显著高于其他管理措施，并且土
壤水溶性有机碳含量随土层深度的增加而降低，土壤水溶性有机碳/土壤有机碳(WSOC/SOC)值随深度增加呈上升趋势;土
壤水溶性氮含量的变化和水溶性碳的变化趋势一致，油松幼林土壤水溶性氮组分含量高于其他管理措施，总体上随深度的增
加而降低． 不同管理措施对 SDOM 组分影响显著，基于三维荧光光谱技术结合平行因子(EEM-PARAFAC)分析可知 SDOM 有4
种组分，主要分为类腐殖质、类蛋白和可溶性微生物代谢产物三大类，其中 SDOM 的主要成分为富里酸类腐殖质，油松幼林土
壤中富里酸含量最高． 本研究表明，管理措施对土壤水溶性碳氮含量变化和 SDOM 组分具有一定的影响，特别是油松幼林和
灌木影响较大． 两种管理措施提高了土壤水溶性有机碳以及水溶性氮组分的含量，增强其在土壤中的迁移转化能力，同时改
变土壤有机物的结构组成，加深腐殖化程度，进一步改善土壤质量．

The Pinus tabulaeformis plantation on the Loess Plateau was selected as the research site to study the changes of soil water-
soluble carbon and nitrogen content and components of soil dissolved organic matter (SDOM) under different management measures
(litter removal，young Pinus tabulaeformis forest，shrubs，grassland)． The uncleared Pinus tabulaeformis plantation was used as the
control． Results show that the soil water-soluble organic carbon content of shrubs and young Pinus tabulaeformis forests was significantly
higher than that in other management measures． The content of soil water-soluble organic carbon decreased with an increase in soil
depth，whereas soil water-soluble organic carbon/soil organic carbon (WSOC/SOC) increased． The change of soil water-soluble
nitrogen content corresponded to that of water-soluble carbon． The content of soil water-soluble nitrogen content in the young Pinus
tabulaeformis forest was higher than that of other management measures，and generally decreased with an increase in depth． Different
management measures have significant effects on SDOM components． Based on three-dimensional fluorescence spectroscopy combined
with parallel factor (EEM-PARAFAC) analysis，four components of SDOM are identified，which are mainly divided into categories，
humus，protein-like，and soluble microbial metabolites in three major categories，among which the main component of the SDOM is the
rich acid humus，and the highest content in the soil of the young forest of Pinus tabulaeformis is rich acid． The results suggested that
management measures had certain effects on soil water-soluble carbon and nitrogen content as well as SDOM components，especially in
young Pinus tabulaeformis forests and shrubs． The young Pinus tabulaeformis forest and shrubs increased the content of soil water-
soluble organic carbon and water-soluble nitrogen，enhanced their ability to migrate and transform in the soil，and changed the
structural composition of soil organic matter，hence enhancing the degree of humification and further improving soil quality．