干热河谷草地灌草组合模式的研究

Study on shrub-grass combined mode in the hot-arid valley grassland

以7种灌草的8种组合模式为研究对象,以退化灌草地为对照,对各种组合模式灌草的保存率、水土保持功能及地上生物量进行了研究,结果表明:木豆Cajanus cajan、银合欢Leucaenaleucocephala以及禾本科的非洲狗尾草Setariasphacelatacv.Narok和豆科大翼豆Macroptilumatropurpureum的各种生物学性状表现优异,而禾本科草高羊茅Festuca arundinaceacv.Fine Lawn以及豆科的白三叶Trifolium repenscv.Haifa、杂三叶T.hybridum不能很好地在金沙江干热河谷山地生长,不能越过干热季;通过不同灌草组合的水土保持功能和地上生物量的研究,筛选出木豆+非洲狗尾草+高羊茅+大翼豆+白三叶+杂三叶为干热河谷最佳灌草组合模式。

This paper selected 8 combined modes of 7 shrub and grass varieties as the materials, took the degradation shrub grassland as control, the survival rate, soil and water conservation function and aboveground biomass of shrub-grass combined modes were studied. The result showed that various biological characteristics of Ca janus ca jan, Leucaena leucocephala , and graminaceous Setaria sphacelata cv. Narok and Legum plant as Macroptilum atropurpureum were excellent. On the contrary, Festuca arundinacea, Trifolium repens and T. hybridum were not adapted well to grow in the jinsha river hot-arid valley, they could not pass over the hot-arid season. By the study of soil and water conservation function and aboveground biomass of various shrub-grass combined modes, the optimal shrubgrass combined mode was selected as C. cajan＋S, sphacelata＋ F. arundinacea＋M, atropurpureum＋ T. repens＋ T. hybridum in the hot-arid valley.