摘要
【目的】研究荒漠草原不同放牧强度下植物补偿性生长特征。【方法】通过不同放牧强度试验,研究荒漠草原植物种群,包括赖草(Leymus secalinus)、长芒草(Stipa bungeana)、糙隐子草(Cleistogenes squarrosa)和牛枝子(Lespedeza potanimii)等4种主要饲用植物的地上净初级生长量。【结果】荒漠草原植物在不同放牧强度下补偿性生长不同,在绵羊放牧强度0.60只/ha(2005年)或0.75只/ha(2006年)时表现为等补偿生长,小于此强度时则发生超补偿生长,大于此强度表现为欠补偿生长。4种主要饲用植物种群在不同放牧强度下补偿性生长特征也不尽相同。根据植物补偿性生长规律,该地区荒漠草原的适宜采食率为18.01%～33.82%。【结论】荒漠草原植物在放牧干扰下存在超补偿性生长情况,降低放牧强度有利于超补偿和等补偿生长的出现。
[Objective] The objective of the research was to study the characteristics of plant compensatory growth under different grazing intensities in desert steppe. [ Method ] Aboveground net primary production of plant and four main forage plant populations named Leymus secalinus, Stipa bungeana, Cleistogenes squarrosa and Lespedeza potanimii were studied by different grazing intensity trials in desert steppe. [Result] Plants in desert steppe behaved different compensatory growth under different grazing intensities. Equal-compensatory growth took place when grazing intensity was 0.60 sheep/ha （in 2005） or 0.75 sheep/ha （in 2006）. Over-compensatory occurred when grazing intensity was less than 0.60 sheep/ha （in 2005） or 0.75 sheep/ha （in 2006）, while under-compensatory growth occurred when grazing intensity was more than the above-mentioned ones. Four main forage plant populations behaved different characteristics of compensatory growth under different grazing intensities. According to plant compensatory growth regularities, feasible intake rate of desert steppe in this region should be between 18.01%-33.82%. [ Conclusion ] Plant in desert steppe can occur over-compensatory growth under grazing interference. Decreasing grazing intensity is beneficial to represent over-compensatory or equal-compensatory growth.
出处
《中国农业科学》
CAS
CSCD
北大核心
2008年第11期3645-3650,共6页
Scientia Agricultura Sinica
基金
宁夏科技攻关计划项目(2006)
宁夏自然科学基金资助项目(NZ0512)
宁夏大学科研基金资助项目(NS0508)
关键词
放牧强度
荒漠草原
植物补偿性生长
采食率
Grazing intensities
Desert steppe
Plant compensatory growth
Intake rate
