短花针茅草对禁牧的响应及休牧期家畜舍饲研究-草业科学专业论文.docx

Banni n g and defer巳d grazing reduced soil bulk density,and increased soil porosity and soil waler content,which was n ot directl y proporti onal to the defered grazing duration
Results of the experiment showed that daily diet supply of straw+
silage+O.+ IOg NaCl were suitable to the local condition.
Key words: Desert steppe; Banning grazing; D笔/专red g razing; Penj专eding
Directed by: Prof. WEI Zhijun
Applicant for Doctor degree: YUN Xiangjun (Grassland Ecology and Management)
(College ofEcology and EnvirolUnental Science,lnner Mongolia Agricultnral University,Huhhot 0 100 18,China)
录
R口
l 引言
川放牧对草地的影响.....................................................………………………...........1
放牧对草地植被的影响......................... ........ … 2
植被特征 ........ ... - ……......... ........ ….....……........... ..... 2
群落多样性......................………….......….......………………….....................3
1. 牧草生物盐和l营养成分 4
植物光合特性................................................................................ ................... 5
植物贮藏性碳水化合物.......................................…………………….............. 6
放牧对草地土壤的影响......................………........…………………….............. 7
. 1 土壤物理性质...…a ..……......... ........ ….....…… 7
土壤化学性质................................... ........ … 8
放牧管理及禁牧休牧研究..... ... ................…..................................................... 9
研究目的和意义............………………….......….......……………………............... 12
2 研究区概况与研究方法............................................. . .. . ......... ........ . ................. 13
研究区自然概况..............……………………........……………………............ 13
.1 地理位置...........…..............………………........……..................................... 13
气候、地貌、土壤..... ……............. ...... … 13
试验区植被构成....... - ……......... ........ … 14
试验设计和研究方法............. ... ................….......………………………....... 15
试验设计...........……........……………....