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Effects of revegetation on organic carbon storage in deep soils in hilly Loess Plateau region of
Authors
张金
王征
+3 more
许明祥
邱宇洁
马昕昕
Publication date
1 January 2012
Publisher
Abstract
以黄土丘陵区不同恢复年限的人工刺槐林、人工柠条林和自然撂荒地为对象,以0~100cm(浅层)土壤为对照,研究了不同植被类型下100~400cm(深层)土壤有机碳(SOC)储量的剖面分布特征和累积动态.结果表明:随土壤深度增加,浅层SOC储量显著降低,深层SOC变化趋势不明显,但储量很高,约占0~400cm剖面SOC的60%.80~100cm土层的SOC储量与深层100~200和200~400cm的SOC储量呈显著线性相关,是0~100cm5个土层中与深层SOC储量变化相关性最强的一层,可用以估算深层SOC储量.人工刺槐林、柠条林、撂荒地表层(0~20cm)SOC储量显著高于坡耕地,而深层SOC储量在不同利用类型间差异不显著.随植被恢复年限的增加,深层SOC储量呈上升趋势,人工刺槐林和人工柠条林100~400cmSOC平均累积速率分别为0.14和0.19t·hm-2·a-1,人工柠条林与浅层SOC累积速率相当.在估算黄土丘陵区植被恢复的土壤固碳效应时,应考虑深层土壤有机碳累积量,否则会严重低估植被恢复的土壤固碳效应.</span
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018