木里矿区4种生态草种适宜播种量筛选

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中图分类号：S812.4 文献标识码：A 文章编号：1007-0435（2026）02-0723-11

Abstract：This study aims to screen the suitable grass species with low sowing rate and high coverage.Four ecological grass species，Poa pretensis ‘Qinghai’，Deschampsia cespitosa，Koeleria macrantha and Elymus tangutorum， were selected as experimental materials to cary out the screening experiment of suitable sowing rate. The characteristics of plant phenotypic traits，biomass and soil nutrients under three sowing rates were analyzed. The results showed that when the sowing rate was 9g⋅m-2 ，the aboveground biomass of Poa pretensis‘Qinghai’，Deschampsia cespitosa and Koeleria macrantha were the highest，which were 296.45g⋅m-2 224.32g⋅m-2 and 236.35g⋅m-2 respectively. The aboveground biomass of Elymus tangutorum was 356.24 g⋅m-2 when the seeding rate was 18g⋅m-2 ，which was significantly higher than other treatments （ ⋅P<0.05 ） When the sowing amount of Poa pretensis‘Qinghai’，Deschampsia cespitosa and Koeleria macrantha reached 9 g⋅m-2 ，the soil nutrient indexes such as organic matter，total nitrogen and total phosphorus performed well.

The seeding rate of Elymus tangutorum was 18g⋅m-2 ，which showed a good soil nutrient status. Principal component analysis of13 indexes of plants and soil showed that thecumulative contribution rate of the first five principal components reached 89.615% . The comprehensive evaluation of membership function showed that the comprehensive evaluation values of Poa pretensis‘ Qinghai’，Deschampsia cespitosa and Koeleria macrantha were the highest when the sowing amount was 9g⋅m-2 ，which were 0.420，0.486 and O.698 respectively. When the seeding rate of Elymus tangutorum was 18g⋅m-2 ， the comprehensive evaluation value was the highest，which was O. 634. To sum up， 9g⋅m-2 is the most suitabel sowing amount for planting Poa pretensis‘ Qinghai’ ，Deschampsia cespitosa and Koeleria macrantha in Muli mining area，and 18g⋅m-2 is Elymus tangutorum in Muli mining area.

Key words：Ecological grass species;Sowing quantity; Biomass; Physical and chemical properties of soil;Muli miningarea;Eco-restoration

木里煤矿位于青海省祁连山南麓，由江仓、聚乎更、弧山和哆嗦贡马4个矿区组成，包括11座露天矿坑，19座渣山，采坑总面积 1433.04hm2 渣山总面积 1856.79hm2[1-2] 。（剩余20149字）