摘要
选择那曲县不同类型草地．实地调查了草地基况以及牧草生长期（2007年5—8月）内具有代表性的6种优势牧草的产量和品质。调查内容包括：草地覆盖度、草地地上生物量、牧草与土壤含水量、草地退化程度以及鼠害情况。同时．选取草地植株样品以及0～10cm表层土壤样品进行牧草品质和土壤养分分析。结果表明．藏嵩草Kobresia tibetica生长状况和地上生物量明显优于其他品种的草地；各样点土壤含水量、土壤养分、毒草所占的比重、鼠害、草地退化状况存在明显差异；从草地地上生物量与气象条件的关系来看，生物量分别与降水量、气温、地温之间均存在显著的正相关关系。从牧草品质来看．在综合考虑含氮量、粗蛋白、粗脂肪等因素的情况下。小嵩草K．pygmaea的品质要优于藏嵩草．点地梅Androsace umbellata品质最差。
The survey on the grassland condition and 6 typical forages in Nagqu County was conducted during the growing season from May to August in 2007 by measuring the vegetation coverage, aboveground biomass, moisture contents in grasses and soil, rodent damage degree. The results showed that Kobresia tibetica was the best in terms of growth and yield. The soil moisture, propor- tion of poisonous grasses, rodent damage degree, grassland degradation degree and soil fertility were significantly different among sampling sites. The biomass was positively related to the precipitation, air temperature and soil temperature. The quality of K. pygrnaea was better than K. tibetica and Androsaceurnbellata was the most poorest in terms of the contents of crude protein and crude fat.
出处
《草业科学》
CAS
CSCD
北大核心
2009年第6期11-17,共7页
Pratacultural Science
基金
国家自然科学基金项目(40665003)
中国气象局成都高原气象研究所专项项目(PMP2006004)
关键词
那曲县
草地状况
生物量
Nagqu County
grassland condition
aboveground biomass
