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OALib Journal期刊
ISSN: 2333-9721
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念青唐古拉山北麓草甸海拔分布上限土壤温湿度的季节变化
DOI: 10.11821/xb201209009, PP. 1246-1254
Keywords: 土壤温度,土壤水分,高山嵩草草甸海拔上限,季节变化,生长季长度,念青唐古拉山
Abstract:
本研究基于西藏念青唐古拉山北麓高山嵩草草甸海拔分布上限(5125m)地下10cm和30cm土壤温度和水分连续3年(2008-2010年)的监测数据,分析了草甸海拔分布上限土壤温度和未冻水含量的季节动态特征。结果表明1)土壤在4月中下旬解冻,10月中下旬冻结;6-8月份土壤温度日振幅最大,10cm和30cm分别为3.8℃和1.4℃;2)土壤未冻水含量回升(下降)在解冻(冻结)开始后,5-10月份未冻水含量较高,其中10cm和30cm分别为2%~6%和15%~20%;3)基于10cm土壤温度推算的本地区高山嵩草草甸海拔分布上限的生长季在6月初至8月末或9月初,持续时间为80-87天,生长季平均土壤温度和含水量分别为6.78±0.73℃和4.14±0.91%,生长季期间日最低温度集中在3~7℃之间(占90%以上天数);4)与较低海拔处(4980m)相比,高山嵩草草甸海拔分布上限处10cm土壤温度和未冻水含量均明显偏低,生长季8月份出现日最低温<5℃的天数也明显增加。
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