摘要
以山西省中阳县为例,在评价退耕还林地豆科牧草气候生态适应性的基础上,对比纯林杂草地,计算分析林草复合模式对气候资源利用率的影响,旨在为当地退耕还林技术模式的优化选择提供理论依据。结果表明:沙打旺、草木樨及紫花苜蓿3种豆科牧草均适合于试验区幼林地种植。其中,沙打旺生育期天数最长,水热系数最高。2002年及2003年牧草生育期间,侧柏-沙打旺复合模式(M1)、侧柏-草木犀复合模式(M2)、侧柏-紫花苜蓿复合模式(M3)分别可使光能利用率提高49.1%(2002)、66.0%(2003),66.2%、85.1%,76.6%、97.2%、热量资源利用率分别提高73.4%(2002)、66.2%(2003),94.8%、85.1%,97.6%、85.8%,降水利用率分别提高79.3%(2002)、81.2%(2003),116.9%、100.4%,77.3%、64.0%和气候资源综合率分别提高70.6%(2002)、81.3%(2003),104.7%、100.5%,71.7%、69.2%。M2和M3气候资源时间利用效率略低于对照,但M1气候资源时间利用效率(ET)要高于对照,2002年与2003年分别可使ET提高16.1%和16.7%。
Based on assessment of climatic ecological adaptability of leguminous grass in returning farmland to forest, a case study on effects of tree-grass models on climate resource efficiency in Zhongyang County of Shanxi Province was conducted, compared with the tree-weed model. The results showed that the leguminous grasses, such as Astragalus adsurgens,Melilvtus suaveolens and Medicago sativa were suitable to plant in young plantations of experimental area. The growing stage of Astragalus adsurgens was longest among the three leguminous grasses, and its hydrothermal coefficient was the highest. During the growing stage of leguminous grasses in 2002 and 2003, for three tree-grass complex systems of Platycladus orientalis--Astragalus adsurgens （ M3 ） , P latycladus orientalis -- Melilvtus suaveolens （ M3 ） and P latycladus orientalis- Medicago sativa （M3）, the utilization efficiency of solar energy was increased by 49. 1% （2002）, 66.0% （2003）; 66.2% ,85. 1% and 76. 6% ,97.2% respectively. The efficiency of thermal resource was increased by 73. 4% （2002） ,66.2%（2003）; 94.8% ,85.1% and 97.6% ,85.8% respectively. The precipitation use efficiency was increased by 79.3% （2002）,81.2%（2003）; 116.9% ,100.4% and 77.3% ,64. 0% respectively. And comprehensive using efficiency of the climate resource was increased by 70. 6% （2002）, 81. 3% （2003）; 104. 7%, 100.5% and 71. 7%, 69. 2% respectively. The climate resource time efficiency （TE） of M2 and M3 was slightly lower than the control, but that of M3 was higher than the control. The TE of M1 during the growing stage in 2002 and 2003 was increased by 16.1% and 16.7%, compared with the control model.
出处
《中国农业气象》
CSCD
2006年第3期167-170,174,共5页
Chinese Journal of Agrometeorology
基金
国家十五科技攻关课题(2004BA510B04)
国家林业局退耕还林科技支撑项目(200377-2)
关键词
豆科牧草
气候生态
黄土丘陵
退耕还林工程
气候资源利用率
Leguminous grass
Climatic ecology
Loess hilly and gully region
Returning farmland to forest
Climate resource use efficiency
