恢复措施对皆伐油松林团聚体活性有机碳含量的影响——以黄土丘陵区松峪沟流域为例

发布时间：2018-06-05 02:28

本文选题：土壤团聚体 + 活性有机碳　；参考：《中国水土保持科学》2017年01期

【摘要】：团聚体中的活性有机碳对土壤质量改善以及碳库动态平衡具有重要意义。为了研究皆伐后土壤团聚体活性有机碳的分布状况,本实验选取黄土高原典型油松林为对象,以未皆伐人工油松林为对照,采用高锰酸钾氧化法研究皆伐后不同恢复植被群落(幼林、撂荒、灌木)地表0~20 cm层土壤团聚体中活性有机碳变化特征。结果表明:1)研究区土壤以大团聚体(250μm)为主,自然恢复的灌木地以及撂荒地大团聚体质量分数显著增加(P0.05)。2)有机碳质量分数随团聚体粒径的增大而增加,大团聚体是有机碳积累的主要场所,并且自然恢复的灌木地团聚体有机碳质量分数最高。3)研究区油松林团聚体低活性有机碳质量分数中活性有机碳质量分数高活性有机碳质量分数,大团聚体活性有机碳质量分数大于微团聚体。研究表明,皆伐会造成团聚体有机碳趋于活化,其中自然恢复的灌木地活性有机碳质量分数显著增加。本研究还进一步发现大团聚体中的高活性有机碳能更好地预测土壤碳库变化。
[Abstract]:The active organic carbon in aggregates is of great importance to the improvement of soil quality and the dynamic balance of carbon pool. In order to study the distribution of active organic carbon in soil aggregate after clear-cutting, the typical Pinus tabulaeformis forest in the Loess Plateau was selected as the object and the unfelled artificial Pinus tabulaeformis forest as control. Potassium permanganate oxidation method was used to study the change characteristics of active organic carbon in soil aggregates of different restoration vegetation communities (young forest, abandoned, shrub) after clear-cutting. The results showed that the content of organic carbon in the soil of the study area was 250 渭 m), and the content of organic carbon in the naturally restored shrub land and abandoned land increased significantly with the increase of the particle size of the aggregate, the results showed that the content of organic carbon in the soil increased with the increase of the particle size of the aggregate, and the content of organic carbon increased with the increase of the particle size of the aggregate. Large aggregates are the main sites for organic carbon accumulation, And the organic carbon fraction of aggregates in naturally recovered shrub land was the highest. 3) in the low active organic carbon fraction of the aggregate of Pinus tabulaeformis forest in the study area, the mass fraction of active organic carbon was high in the low active organic carbon fraction. The mass fraction of active organic carbon in large aggregates is higher than that in microaggregates. The results showed that clear cutting would lead to the activation of organic carbon in aggregates, and the fraction of active organic carbon in the naturally recovered shrub land would increase significantly. It was also found that high active organic carbon in large aggregates could better predict soil carbon pool changes.
【作者单位】：西北农林科技大学水土保持研究所;中国科学院水土保持与生态环境研究中心;
【基金】：国家科技支撑课题“陕北水蚀区植被功能调控技术与示范”(2015BAC01B03) 中国科学院重点部署项目“黄土丘陵区集约经营型流域生态经济协同发展技术研究与示范”(KFZD-SW-306-2)
【分类号】：S714

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