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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
景航1; 刘国彬1,2; 王国梁1,2; 薛萐1,2; 姚旭1; 梁楚涛2
2017
Source Publication中国水土保持科学
Volume15Issue:1Pages:113-120
Abstract

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( > 250 μm) 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( P <
0. 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。

Other Abstract

Labile organic carbon ( LOC) is an important factor of soil organic carbon
pool,and it can be more sensitive to environment change than any other factor. LOC in aggregate
significantly influences soil quality and protection of carbon pool. In order to achieve the scientific
management of restoration communities after clear-cutting,it is of great significance to investigate the
relationship between soil aggregates and LOC in the area. [Methods]Concentrations of soil aggregates
and LOC of restoration communities in Chinese pine plantations of the Loess Plateau after clear-cutting
were investigated. There were 3 types of restoration community ( shrub land,abandoned forestland and
young plantation land. ) and no clear-cutting forest as control ( CK) . Undisturbed soil samples were
collected at 0 - 20 cm soil layer,the volume fraction of aggregate were tested using wet screening,theconcentrations of soil total organic carbon were determined using H2 SO4-K2 Cr2 O7 oxidation,and the
concentrations of soil LOC were measured using KMnO4 oxidation. Analysis of variance and linear
regression analyses were done using SPSS ( 12. 0) . [Results] 1) Macro-aggregate ( > 250 μm) was
dominant in aggregate composition. Compared with CK,the types of restoration community after clearcutting
presented significant effects on the distribution of aggregates. The percentage of micro-aggregate
significantly decreased ( P < 0. 05) while that of macro-aggregate significantly increased ( P < 0. 05) in
shrub land and abandoned forestland. Aggregate composition in young plantation land showed no
significant changes. 2 ) The concentration of aggregate organic carbon increased with aggregate size
increasing. There was the highest concentration of organic carbon in shrub land. The concentration of
aggregate organic carbon was more sensitive than that of bulk soil organic carbons to different type of
restoration community. 3) The concentration of LOC in soil aggregate decreased with the improvement of
labile state,and LOC concentration of macro aggregate was greater than micro aggregates. Compared with
CK,the organic carbon of soil aggregate became more highly labile under different restoration
communities. The concentration of aggregate LOC significantly increased in shrub land, and the
concentration of LOC in macro-aggregate was more sensitive to different type of restoration community
than that in any other aggregate size. 4) Results of correlation analysis showed that LOC in aggregates
presented a significant correlation with organic carbon in bulk soil. The correlation of LOC in macroaggregate
with organic carbon in bulk soil was better than micro-aggregate. Highly LOC showed better
correlation with organic carbon in bulk soil than lowly LOC. Therefore,highly LOC in macro-aggregate
correlated best with organic carbon in bulk soil. [Conclusions]These results proved that different type
of restoration community resulted in soil organic carbon unstable,and aggregate LOC in shrub land
significantly increased. To some degree,our results uncovered the distribution characteristics of soil
aggregate LOC in the Loess Plateau and indicated the effect of clear-cutting on aggregate labile organic
carbon. According to these results, shrub land in restoration community can be a considerable
management measure after clear-cutting Chinese pine forest in the Loess Plateau. Based on previous
researches,our findings indicate that highly LOC in macro-aggregate can be a better index for measuring
the dynamic of soil organic carbon than LOC in bulk soil.

Keyword土壤团聚体 活性有机碳 油松人工林 皆伐 土壤有机碳
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8433
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学水土保持研究所
2.中国科学院水土保持与生态环境研究中心
Recommended Citation
GB/T 7714
景航,刘国彬,王国梁,等. 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[J]. 中国水土保持科学,2017,15(1):113-120.
APA 景航,刘国彬,王国梁,薛萐,姚旭,&梁楚涛.(2017).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.中国水土保持科学,15(1),113-120.
MLA 景航,et al."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".中国水土保持科学 15.1(2017):113-120.
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