摘要
研究退化红壤不同治理措施对土壤水稳性团聚体及其有机碳的影响。结果表明,恢复林地提高了0-20cm、20-40cm土层>0.25mm水稳性团聚体(WSA)含量和平均重量直径(MWD),显著提高土壤水稳性。表土中,大体上侵蚀林地WSA含量及其有机碳含量随粒径减小而增大,恢复林地随粒径增大而增大,并向>5mm、5～2mm两粒径富集,且侵蚀地、不同年代治理的林地、次生林间差异达显著水平(P<0.05);底土中,次生林、黑荆治理的林地WSA分布及有机碳含量变化与其表层的变化趋势相似,其他林地大体上向5～2mm、1～0.5mm两粒径富集。WSA含量及密度具有表聚性,且主要取决于治理年限、治理措施。
In this paper,the distribution of soil water-stable aggregates（WSA） and its organic carbon contents in different forestland restoration were studied.Results showed that forestland resoration increased the content of WSA 0.25 mm and mean weight diameter（MWD） in 0-20 cm,and 20-40 cm soil layers,and enhanced the soil water stability significantly.In the 0-20 cm layer of erosion forestland＇s soil,the contents of WSA and organic carbon reduced as the increasing of soil particle size.On the contrary,the contents of WSA and organic carbon increased with the increasing of soil particle size in restore forestland soils,and organic carbon enriched in aggregates fractions over 2 mm.There were significant（P0.05） differences among soil erosion,restored forest and the secondary forest.In the 20-40 cm layer soil,the content of WSA and its organic carbon were similar to the surface layer in the secondary forest and Acacia mearnsii planting recovery soils,other newly recovery forestland＇s WSA and its organic carbon mostly appeared in aggregate fractions of 5～2 mm and 1～0.5 mm.The content of WSA was enriched in the surface layer,and mostly depended on the recovery time and the restoration measures.
出处
《水土保持学报》
CSCD
北大核心
2012年第1期190-194,199,共6页
Journal of Soil and Water Conservation
基金
国家"十一五"科技支撑计划项目(2009BADC6B006)
关键词
水稳性团聚体
土壤有机碳
退化红壤
water-stable aggregate
soil organic carbon
degraded red soils
作者简介
蓝良就（1969-），男，博士研究生，主要从事恢复生态学研究。E-mail。lanliangjiu@163．com
通讯作者：黄炎和（1962-），男，博士，教授，博士生导师，主要从事侵蚀劣地生态恢复研究。E-mail。yanhehuang@hotmail．com
