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吕渡,张晓萍.不同恢复类型植被细根分布及与土壤理化性质耦合关系.生态学报,2018,(11).http://dx.doi.org/10.5846/stxb201709021585  
不同恢复类型植被细根分布及与土壤理化性质耦合关系
Fine Root Biomass Distribution and Coupling to Soil Physicochemical Properties under Different Restored Vegetation Types
投稿时间:2017-09-02  修订日期:2018-01-17
DOI: 10.5846/stxb201709021585
关键词黄土高原  退耕年限  植物细根  恢复方式  团聚体稳定性  土壤理化性质
Key WordsLoess Plateau  abandoned years  fine root  vegetation recovery and restoration  soil aggregate stability  soil physical and chemical properties
基金项目国家自然科学基金(41440012)
作者单位E-mail
吕渡 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室 1029354468@qq.com 
张晓萍 西北农林科技大学水土保持研究所 zhangxp@ms.iswc.ac.cn 
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摘要:
本研究针对陕北典型黄土丘陵区吴起县主要人工造林和自然封育植被恢复类型,确定5、15和40年不同退耕年限下的沙棘、山杏及自然恢复草地样地,进行剖面采样,分析不同植被恢复类型下细根生物量、土壤理化性质,研究了不同恢复类型和不同年限植被细根生物量与土壤理化性质随时间的变异规律及耦合关系。结果表明, 1)总体上,主要造林树种和退耕自然封育草地细根生物量都随林龄和退耕年限的增长呈增加趋势,同年限人工造林树种细根生物量大于自然恢复的草地,不同植被群落细根生物量均表现出随着深度的增加呈指数递减规律。2)自然封育的草地生态系统土壤含水量大于人工山杏林和沙棘林。人工造林和自然封育植被恢复下,土壤团聚体稳定性都随退耕年限的增加而增强,有机质、全氮、全磷含量也都呈增加趋势,土壤平均含水量则呈减小趋势。3)细根生物量与土壤容重和团聚体稳定性显著相关,植物细根在土壤结构改善中起到了重要作用。
Abstract:
In this study, according to the main types of artificial afforestation and natural enclosure vegetation restoration in Wuqi county in typical loess hilly region of northern Shaanxi, the samples of Hippophae reamnoides, P- armeniaca forests and natural restoration grassland under different cropping years in 5, 15 and 40 years were selected and sampled on soil profiles, then the fine root biomass and soil physicochemical properties were analyzed, afterward the variation regularity and coupling relationship between them were studied under different restoration types and different years. The results are as follows: 1) In general, the fine root biomass of abandoned grassland and Prunus armeniaca forests showed an increasing trend with the increase of abandoned years and stand age. The fine root biomass of the artificial tree species was larger than that of natural restoration grassland, and the biomass showed a decreasing exponential law with increasing depth. 2) The soil water content of grassland ecosystem was significantly higher than that of artificial Prunus armeniaca and Hippophae reamnoides forests. The stability of soil aggregates increased both under the artificial afforestation and natural enclosure vegetation coverage, and the content of organic matter, total nitrogen and total phosphorus were also improved, and the soil average water content was reduced with the increasing abandoned years. 3) Fine root biomass had an obvious correlation with soil bulk density and agglomerate stability, and the fine roots did play an important role in soil structure improvement.
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