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### 陕北水蚀风蚀交错区小流域苔藓结皮的空间特征及其影响因子

1. 1. 西北农林科技大学水土保持研究所, 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
• 收稿日期:2012-07-17 修回日期:2013-06-24 出版日期:2014-03-20 发布日期:2014-03-20
• 作者简介:卜崇峰（1977－），男，陕西榆林人，博士、硕士生导师，主要从事生物土壤结皮与水土保持工程研究工作。E-mail：buchongfeng@163.com
• 基金资助:

国家自然科学基金项目（41071192，40701096）；中国科学院西部之光（B28013200）；西北农林科技大学科研专项（QN2009085）

### Spatial Characteristics of Moss-Dominated Soil Crust and Its Impact Factors in Small Watershed in Wind-Water Erosion Crisscross Region, Northern Shaanxi Province, China

BU Chong-feng1,2, ZHANG Peng1, YE Jing2, MENG Jie1

1. 1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China;
2. Institute of Soil and Water Conservation, CAS and Ministry of Water Resources, Yangling 712100, Chin
• Received:2012-07-17 Revised:2013-06-24 Online:2014-03-20 Published:2014-03-20

Abstract:

Biological soil crusts (BSCs) are a widespread ground living cover in arid and semi-arid areas, which serve as an important ecological function in ecosystems of arid areas. To study its development characteristics and formation mechanism is the basis of effective management and utilization of these resources. Since the implementation of Grain for Green Project, the ecosystem of the Loess Plateau recovered extensively, and BSCs widely developed. However, the related researches are still deficient compared to those in the desert area. Due to the complexity of BSCs' development process and its spatial differentiation, many results of researches carrying out in desert areas can not be directly extrapolated to the loess area. In view of this, this paper chose a typical small watershed in the Loess Plateau, carried out a comprehensive survey, made lots of calculation and analysis by using GIS software, discussed the distribution characteristics of the BSCs and its influencing factors. The results showed that: 1) a total of 13 species of mosses belonging to eight genera under two families were found in the watershed. Of which Bryum algovicum Sendt., Bryum argenteum Hedw. and Didymodon constrictus (Mitt.) Saito. are most widely distributed. 2) Moss crust had the absolute advantage with an area of 4.18 km2, accounting for 60.7% of the watershed area, which are mainly distributed on the hill slope or slope top for less erosion or less disturbance, and better soil water conditions. 3) Soil, vegetation and slope aspect had a significant effect on the development of BSCs. Compared with the loess area, BSCs in sandy area had a high coverage and showed a continuous distribution. The development of BSCs under the tree and shrub vegetation was superior to those under herbaceous communities, and the vegetation coverage promoted first and then inhibited the development of BSCs (inflection point at 30% of the coverage). Overall, the coverage and thickness of the BSCs were greater on shady slope than those on sunny slope.

• S154.1