2024年2月29日 星期四
黄土高原子午岭退耕地土壤物理性质与群落特征
Study of soil physical properties and community characteristics of different abandoned lands in Ziwuling area of Loess Plateau
2006年 第15卷 第2期 页码[42-46]    下载全文[0.7MB]  
摘要

通过对子午岭北部黄土丘陵沟壑区4、9、15和20 a退耕地的生境和植被群落特征的分析,研究了不同年限退耕地的植被群落、土壤水分、容重和生物量的变化。结果表明:随退耕年限的增加,杂草群落中物种分布较均匀,物种丰富度明显增加,植物种数和个体数增加,其优势种和亚优势种分属于6科9属;根系在土层中分布增多,在一定深度范围内土壤结构逐渐疏松,致使土壤容重随退耕年限的增加而减小;在0~80 cm土层内土壤含水量从高至低依次为4 a、20 a、15 a和9 a退耕地;80~300 cm土层的土壤含水量得到明显改善,土壤含水量从高至低依次为20 a、4 a、15 a和9 a退耕地;地面生物量随退耕年限的延长而增加,但增加幅度逐渐趋于缓慢。

Abstract

The evolution of environments and plant community characteristics in different abandoned lands were analyzed after abandonment for 4, 9,15 and 20 a, and the plant community characteristics, bulk density, water content and biomass of the different abandoned lands were also researched in the course of succession in hilly-gully regions in north Ziwuling of Loess Plateau. Results showed that in the progress of slow succession, plant species were distributed equally in weed community and the number of species and individuals was increased prominently; dominant and sub-dominant species belonged to 9 genera and 6 families. The distribution of root systems was increased in soil and soil configuration got loosen. As a result, the bulk density was decreased in certain depth. Soil moisture was ordered from large to small: 4 a, 20 a, 15 a, 9 a and 20 a, 4 a, 5 a, 9 a abandoned lands in 0 -80 cm and 80 -300 cm depth soil respectively. Above-ground biomass was increased with abandoned time, but the trend was slow.

关键词黄土高原; 退耕地; 土壤水分; 植被特征;
Key wordsLoess Plateau; abandoned land; soil moisture; vegetation characteristics
作者刘 勇1,王凯博1,上官周平1,2
所在单位1.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,陕西杨陵712100;
2.中国科学院水利部水土保持研究所,陕西杨陵712100
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基金项目教育部新世纪优秀人才培养计划项目; 西北农林科技大学拔尖人才与创新团队建设计划项目; 中国科学院西部之光人才培养计划联合学者项目资助;