围栏封育对昭苏马场春秋草地地上植物量的影响

Effects of enclosing spring-autumn grassland on aboveground biomass at Zhaosu horse ranch

通过对昭苏马场春秋草地不同围栏封育年限草地地上植物量的研究,结果表明:草地地上植物量随着围栏封育年限的延长呈增加趋势,围栏封育5和6年草地地上植物量随季节的变化呈"S"型增长曲线,未围栏封育草地地上植物量累积变化呈双峰曲线;围栏封育5和6年与围栏封育1年和未围栏封育草地的禾草类和豆科草类间差异极显著(P<0.01),随着围栏封育年限的延长,杂类草所占比例下降,而优良禾草类比例明显升高,在群落中占据优势地位,不同围栏封育年限草地地上植物量的绝对生长率和相对生长率的季节变化相似,在植物营养生长初期率都较大,此后都呈下降趋势。

An investigation on the effects of enclosing spring-autumn grassland aboveground biomass in Zhaosu horse ranch in Xinjiang was conducted. The results showed that aboveground biomass in- crease gradually with the restoration of the enclosed natural grassland,aboveground biomass changes as the ＂S＂ curve of growth with season change in 6 a,5 a, 1 a enclosed grasslands,aboveground biomass accumulation of un- enclosed grassland changes as bimodal curve. The above-ground biomass of grasses, sedges and communities a- mong 6 a,5 a enclosed grasslands, 1 a enclosed and unenclosed grassland showed significant difference. The per- centage of forbs decrease,the percentage of grasses increases gradually,and in the communities the forbs were dominant with the restoration of enclosed natural grassland. AGR and RGR of Community aboveground biomass appear the similar trend with seasonal changes, and relatively great in the early plant growing season, the general trends of AGR and RGR declined with process of the plant growth.