【摘要】：為了研究切根與施肥對羊草(Leymus chinensis)草甸植被特征和營養(yǎng)成分的影響,以松嫩草原中南部姜家甸草場為研究對象,分析不同切根及配合施用氮磷肥、有機肥處理下植被群落特征和營養(yǎng)成分。結(jié)果表明:各切根與施肥處理均提高了群落蓋度(P0.05),以連續(xù)兩年施用中高水平氮磷肥最高,達到100%。氮磷肥的施用效果優(yōu)于有機肥;第一年氮磷肥處理下羊草高度均達到50 cm以上;群落密度和羊草密度在連續(xù)兩年施用氮磷肥處理下較高,尤其是第二年高水平下達到2 687株/m2。連續(xù)兩年施用高水平氮磷肥群落和羊草地上生物量、0~10 cm地下生物量和羊草根莖生物量達到最大,分別為701.57 g/m2、1 056.79 g/m2和511.84 g/m2。第二年裂區(qū)施肥處理羊草粗蛋白含量高于不施肥處理,而各處理羊草中性洗滌纖維和酸性洗滌纖維含量兩年間變化較小。切根配合施N 150 kg/hm2,P 90 kg/hm2為最佳處理組合,可顯著改良草地退化狀況。
[Abstract]:In order to study the effects of cutting root and fertilization on vegetative characteristics and nutrient composition of (Leymus chinensis) meadow of Leymus chinensis, the effects of different cutting roots and combined application of nitrogen and phosphorus fertilizer on Jiangjiadian grassland in the south central part of Songnen grassland were studied. Characteristics and nutrient composition of vegetation community under organic fertilizer treatment. The results showed that each cutting root and fertilization treatment increased the community coverage (P0.05), and the application of middle and high level N and P fertilizer for two consecutive years was the highest, reaching 100%. The application effect of N and P fertilizer was better than that of organic fertilizer, and the height of Leymus chinensis under N and P fertilizer treatment was more than 50 cm in the first year. The community density and Leymus chinensis density were higher under N and P fertilizer application for two consecutive years, especially at a high level of 2 687 plants / m2 in the second year. For two consecutive years, the underground biomass of 0 / 10 cm and the rhizome biomass of Leymus chinensis were 701.57 g / m ~ 2, 1 056.79 g/m2 and 511.84 g / m ~ 2, respectively, when high-level N / P fertilizer community and sheep grassland were applied to each other for two years. The content of crude protein in Leymus chinensis treated by fertilization in the second year was higher than that without fertilization, but the content of neutral detergent fiber and acid detergent fiber of Leymus chinensis in each treatment changed little during the two years. Cutting root combined with N 150 kg/hm2,P 90 kg/hm2 was the best treatment combination, which could significantly improve the degradation of grassland.
【作者單位】： 吉林省農(nóng)業(yè)科學院;吉林農(nóng)業(yè)大學動物科學技術學院;
【基金】：公益性行業(yè)(農(nóng)業(yè))科研專項(201303060) 國家自然科學基金項目(41601053) 吉林省擇優(yōu)資助博士后科研項目“吉林省西部地區(qū)不同恢復模式下草地碳匯功能演變研究”
【分類號】：S812

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