摘要
植物和土壤的耦合协调关系是生态恢复、退耕还林还草工程顺利实施的关键。该文基于典型喀斯特峰丛洼地7种代表性退耕还林还草模式植被土壤的全面调查和取样分析,建立9个植被因子和15个土壤因子的2级层次指标体系,采用层次分析法确定各因子的权重,构建了7种模式的植被土壤耦合度和耦合协调度模型。结果表明:不同退耕还林还草模式的耦合度和耦合协调度并不一一对应,植被与土壤的综合指数在全体模式中的位置也并不完全一致,退耕种植任豆+桂牧1号的植被效应和退耕种植香椿的土壤改良作用最好。退耕5年后各模式的植被土壤耦合协调状况还不十分理想,除香椿和撂荒处于中级协调发展时期外,其他退耕模式均还处于失调衰退和过度发展时期,耦合协调度模型只有桂牧1号和撂荒处于植被土壤同步型。喀斯特峰丛洼地实施退耕还林还草工程时应同步提高植物生长抚育和土壤管理水平。
Coupling coordinative relationship of vegetation and soil is the key for ecological restoration and for implementing grain for green project. Based on the investigation and analysis of vegetation and soil in seven grain for green patterns in depressions between karst hills, a two-level target system of nine vegetation factors and fifteen soil factors was conducted, and the weight of factors was determined by step weight analysis and models of vegetation and soil coupling degree and coupling coordinative degree were constructed. The results showed that the relationships of coupling degree and coupling coordinative degree of grain for green patterns were not one-to-one correspondence in the region, and the integrative indexes of vegetation in the patterns didn＇t quite fit with those of soil. The vegetation effects of Zenia insignis ＋ Guimu No. 1 Forage pattern and the soil improvement effects of Toona sinensis pattern were best in these patterns. The status of vegetation and soil coupling coordination in the patterns after 5 years＇ was still not ideal, as except for patterns of Toona sinensis and deserting cultivation were in the stage of middle level coordinative development, and other patterns were in the stages of deterioration caused by disorders or overdevelopment. Only the models of vegetation and soil coupling coordinative degree for patterns of Guimu No. 1 Forage and deserting cultivation were in synchronization. Therefore, improvement of vegetation growth and soil management should be done during the application of grain for green project in depressions between karst hills.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2011年第9期305-310,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院西部行动计划项目(KZCX2-XB3-10)
国家科技支撑计划(2010BAE00739,2009BADC6B008)
国家自然科学基金项目(Nos.31000224,31070425,30970508和U1033004)
中国科学院“西部之光”人才培养计划
关键词
植被
土壤
耦合
模型
退耕还林还草
喀斯特峰丛洼地
vegetation
soils
couplings
models
grain for green
depressions between karst hills
