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天然次生林与人工林对黄土丘陵沟壑区深层土壤有机碳氮的影响
引用本文:孙文义,郭胜利.天然次生林与人工林对黄土丘陵沟壑区深层土壤有机碳氮的影响[J].生态学报,2010,30(10):2611-2620.
作者姓名:孙文义  郭胜利
作者单位:1. 中国科学院水利部水土保持研究所,陕西杨凌,712100
2. 中国科学院水利部水土保持研究所,陕西杨凌,712100;西北农林科技大学水土保持研究所,陕西杨凌,712100
基金项目:国家自然科学基金面上资助项目(40771125)
摘    要:研究深层土壤有机碳、氮(Soilorganic C,SOC,Totalsoil N,TSN)量对摸清陆地生态系统深层碳氮固定潜力,寻找碳汇丢失之谜和应对全球气候变暖具有重要意义。以黄土区子午岭林场3种典型人工林(油松、刺槐、小叶杨)和3种天然次生林(辽东栎、白桦、鼠李)为对象,在设立的18个样方内,分层测定了0-100cm土层SOC、TSN和DOC(Dissolved organic C,DOC)量变化,监测了样方内地表长年凋落物积累量及其碳氮组成。1m土层内SOC、TSN和DOC含量天然次生林显著高于人工林。与人工林相比,天然次生林表层(0-20cm)SOC、TSN储量分别高42%、22%,但20-100cm土层SOC、TSN储量相对量最大。人工林下,20-100cm土层SOC储量为33.6thm-2,占1m土层的55%;TSN储量为3.9thm-2,占1m土层的57%;天然次生林下,20-100cm土层SOC、TSN储量分别为55.3thm-2、6.0thm-2,占1m土层储量分别为59%和63%。其中,40-60cm天然次生林比人工林碳氮储量分别高了82%、65%;其次为20-40cm,天然次生林比人工林碳氮储量分别高了73%、65%。不同植被恢复条件下,SOC与DOC、TSN、Olsen-P都表现出较强的相关性。研究表明,植被恢复有利于土壤碳氮的积累,不仅表层土壤,深层土壤也具有较强的碳氮固定能力;天然次生林土壤碳氮固定能力和长年地表凋落物量都高于人工林。

关 键 词:        固定能力    天然次生林    人工林    深层
收稿时间:2009/3/26 0:00:00
修稿时间:2010/3/15 0:00:00

Effects of secondary and manmade forests on soil organic C and N in subsurface soil in hilly region of the Loess Plateau
SunWenyi and GuoShengli.Effects of secondary and manmade forests on soil organic C and N in subsurface soil in hilly region of the Loess Plateau[J].Acta Ecologica Sinica,2010,30(10):2611-2620.
Authors:SunWenyi and GuoShengli
Affiliation:Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource,Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource
Abstract:Exploring contents of soil organic C (SOC) and total soil N (TSN) in subsoil is crucial to finding out soil organic C and N sequestration potential in terrestrial ecosystem,the missing carbon sink and dealing with global warming. Data were presented on changes in soil organic C (SOC),total soil N (TSN) and Dissolved organic C (DOC) in three manmade forests (Pinus tabulaeformis,Robinia pseudoacacia,Pobulus simonii) and three secondary forests (Quercus liaotungensis,Betula platyphyllum,Rhamnus davurica) in Zi...
Keywords:C  N  sequestration capacity  secondary forests    manmade forests  subsurface
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