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黄土高原不同降雨量带退耕地植被 - 生物结皮的分布 格局
王一贺1,3; 赵允格1,2; 李 林2; 高丽倩1,3; 胡忠旭2
Source Publication生 态 学 报

组成、盖度及其空间变化。结果表明:1)在黄土高原降水量 250—550 mm 地区的退耕地及自然荒坡上,维管束植物与生物结皮
生物结皮盖度变化于 80. 8%—55. 1% 之间,在不同降雨量带之间差异显著,250—350 mm 降雨量带生物结皮平均盖度(77.
8%)显著高于 350—500 mm 降雨量带(60. 3%),但不同类型生物结皮盖度差异显著性不同。3)黄土高原地区不同降雨量带维
管束植物冠层盖度变化于 10. 0%—58. 7%,随降雨量的增加而增加,一定程度上限制了生物结皮的发育和演替,两者表现出了

Other Abstract

 Biological soil crusts ( biocrusts) were extensively recovered on the surface of revegetated lands after the
implementation of the“Grain for Green”Project,which is a program for retransforming croplands on steep slopes (≥25°)
into grasslands and shrublands in order to restore ecosystem functions in the Loess Plateau region. The distribution patterns
and spatial variability of biocrusts and vascular plants in the revegetated lands in this region have rarely been considered in
previous studies. The coverage,patch size,and number of vascular plants as well as biocrust cover and composition were
investigated in six successive rainfall zones ranging from 250 mm to 550 mm in the Loess Plateau region so as to determine
the distribution patterns and their spatial variation. The following observations were made from the results: 1) Revegetated  lands showed a mosaic pattern of vascular plants and biocrusts across the rainfall gradient. Biocrusts were mostly distributed
continuously within each site,while vascular plants often existed in patchy mosaics. 2) Biocrust coverage in different
rainfall zones in the region ranged between 55. 1% and 80. 8%. The average biocrust coverage in the 250—350 mm rainfall
zone was 77. 8%,which was significantly higher than that in the 350—500 mm rainfall zone (60. 3%). However,no
significant difference was observed in the community composition of biocrust along this gradient. 3) Vascular plant coverage
in the region ranged from 10. 0% to 58. 7%. An obvious and significant increasing trend was observed in the coverage along
with the increase of annual mean precipitation. 4) Total and average basal patch area of vascular plants also increased along
with annual mean precipitation,while the number of individual plants decreased. Given this general trend,the smallest
plants (basal radii < 0. 1 cm) dominated the plant patch-size distributions in all the rainfall zones. These results reveal the
intercorrelation of spatial pattern and distribution of biocrusts and vascular vegetation across environmental gradients in the
Loess Plateau region.

Keyword生物结皮 维管束植物 斑块 降雨量带 镶嵌分布
Indexed By中文核心期刊要目总览
Document Type期刊论文
Affiliation1.中国科学院教育部水土保持与生态环境研究中心,黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌 712100
2.西北农林科技大学资源环境学院,杨凌 712100
3.中国科学院大学,北京 100049
Recommended Citation
GB/T 7714
王一贺,赵允格,李 林,等. 黄土高原不同降雨量带退耕地植被 - 生物结皮的分布 格局[J]. 生 态 学 报,2016,36(2):377-386.
APA 王一贺,赵允格,李 林,高丽倩,&胡忠旭.(2016).黄土高原不同降雨量带退耕地植被 - 生物结皮的分布 格局.生 态 学 报,36(2),377-386.
MLA 王一贺,et al."黄土高原不同降雨量带退耕地植被 - 生物结皮的分布 格局".生 态 学 报 36.2(2016):377-386.
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