施肥和刈割处理模拟放牧对西北针茅生长的影响

放牧是天然草地最主要的利用方式,其对于草地的影响主要是采食、践踏和排泄作用.不同畜种具有不同的牧食行为,对于草地的影响也不同.为了研究牛羊混合放牧对于西北针茅(Stipa sareptana var.krylovii)草原建群种的影响,本研究设置了对照、添加牛粪+刈割(模拟牛单牧)、添加羊粪+不刈割(模拟羊单牧)、添加...

Simulating the Effect of Grazing on the Growth of Stipa sareptana var . kry lovii by Adding Fertilizer and Mowing

Grazing is the most important use of natural grassland,and its effects on grassland are mainly feeding,trampling and excretion. Different types of livestock have different grazing behaviors,and their effects on grassland are also different. In order to study the effect of mixed grazing of cattle and sheep on the constructive species of the Stipa sareptana grassland,following indoor experimental treatments were designed in this study:control (CK_s),addition of cow dung + mowing (to simulate cow single-grazing,CG_s),adding sheep dung + no mowing (to simulate sheep single-grazing,SG_s),adding cow and sheep dung + mowing (to simulate cow and sheep mixed grazing,MG_s). The root and shoot growth dynamics of Stipa sareptana var. krylovii. were determined from June to December. The results showed that the height of Stipa sareptana var. krylovii. under the MG_s treatment was higher than SG_s or CG_s,the number of its tillers was moderate,but the root production was relatively low;Based on these,we can draw a conclusion that mixed grazing with cattle and sheep is more likely to increase the productivity of Stipa sareptana var. krylovii steppe. Dynamic observations found that the root of Stipa sareptana var. krylovii under different treatments were mainly produced in the growing season,and roots mainly died in the non-growing season.