不同开垦年限黑土区坡耕地土壤团聚体稳定性与有机质关系-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

资源与环境科学

不同开垦年限黑土区坡耕地土壤团聚体稳定性与有机质关系

张孝存1,2,郑粉莉3,4*,王彬3,安娟4

(1 陕西师范大学旅游与环境学院，陕西西安 710062； 2 商洛学院城乡发展与管理工程系，陕西商洛 726000； 3 西北农林科技大学资源环境学院，陕西杨陵 712100；4 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨陵 712100)

张孝存，男，副教授，博士研究生，主要从事土壤质量评价研究.Email: zhangxiaocun2005@163.com.

摘要:

从不同开垦年限、土层和地形部位三个视角，应用慢速湿润法研究了东北黑土区坡耕地表层3～5 mm土壤团聚体稳定性与有机质的关系.结果表明：黑土开垦后，随着土壤有机质含量下降，土壤团聚体水稳性也明显降低；40 a以后，随着开垦时间的延长，两者的变化逐渐趋于稳定和平缓.MWDSW值、＞0.2 mm水稳定性土壤团聚体含量均与有机质含量显著正相关，相关系数分别是0.979和0.956(P＜0.05).表层土壤团聚体水稳性高于次表层土壤，这与表层土壤有机质含量高于次表层有关.不同土层>0.2、>0.5 mm水稳性团聚体含量，MWD值与相应有机质含量相关系数分别为0.51、0.56、0.59（P<0.05），达到显著相关水平.不同地形部位表层土壤团聚体稳定性沿坡面呈波状起伏变化，变化规律不明显，主要是由于坡面不同地形部位土壤侵蚀、搬运和沉积作用强弱不同造成的.三种情况下，黑土表层土壤MWD值与有机质含量均显著相关.

关键词：

团聚体水稳性；土壤有机质；坡位；黑土

收稿日期：

2011-03-17

中图分类号：

S152.4

文献标识码：

文章编号：

16724291(2011)05009006

基金项目：

中国科学院西部行动计划（二期）（ KZCX2XB20503）；西北农林科技大学创新团队（01140202）；陕西省教育厅科研专项计划(2009JK423).

Doi:

The relationships between aggregate water stability and soil organic matter of slope land with different reclamation years in black soil region

ZHANG Xiaocun1,2, ZHENG Fenli3,4*, WANG Bin3, AN Juan4

(1 College of Tourism and Environment, Shaanxi Normal University, Xi′an 710062,Shaanxi, China; 2 Department of Urban Development and Management Engineering, Shangluo University, Shangluo 726000, Shaanxi, China; 3 College of Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China; 4 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, Shaanxi, China)

Abstract:

The relationships between aggregate water stability (3～5 mm) and organic matter of top soil in slope land, black soil region of Northwest China, were studied by slow wetting method from the perspectives of different reclamation years, soil layers and landforms. The results showed that soil aggregate water stability decreases significantly with the declining of soil organic matter after reclamation, but 40 years later, the change trend of both becomes steady and gentle. The content of waterstable aggregate with ＞0.2 mm, and MWDsw value is notably related with the organic matter, and the correlative coefficients is 0.979 and 0.956(P＜0.05). Water stability in the surface soil is much better than that of subsurface. It lies in the content of the organic matter in surface soil is higher than that in subsurface. The correlation coefficient of waterstable aggregates of ＞0.2 mm, ＞0.5 mm and MWD value with organic matter is 0.59, 0.51 and 0.56 respectively. The waterstable aggregate of surface soil in different landform presents a wavy change, and the change is not very regularly which is caused by the different power of soil erosion, movement, deposition in slope position. MWDsw value is notably related with the organic matter of subsurface soil under three conditions.

KeyWords:

aggregate water stability; soil organic matter; geomorphic position; black soil