| 姚晓红,许彦平,陈晶,袁佰顺,李晓东,韩维顺.近30年气候变化对小陇山林业资源的影响研究[J].干旱地区农业研究,2005,(5):236~243 |
| 近30年气候变化对小陇山林业资源的影响研究 |
| A study on the forest resource affected by climate changing in last 30years in Xiaolong mountain |
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| DOI：10.7606/j.issn.1000-7601.2005.05.47 |
| 中文关键词: 气候变化 气象条件 森林资源 |
| 英文关键词:climate changing medteorological factors forest resource |
| 基金项目:天水市气象局科研专项(2004) |
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| 中文摘要: |
| 通过1985年、1994年甘肃小陇山林区两次森林资源二类调查和1998年、2000年两次森林资源统计资料分析,得出近30a来该区森林资源呈减少趋势,以20世纪90年代最为严重。利用区内7090年代主要气象要素的演变特征,进行综合分析和量化计算得出影响森林资源正常生产的主要气象条件是年≥0℃积温及降水量,且水热的合理匹配更为重要。其适宜的水热匹配指标:年均降水量525mm,以495~555mm为宜,年≥0℃积温3930(℃.d),以3555~4340(℃.d)最佳。区内90年代以来降水减少,气候变暖,水热匹配极差,年3930(℃.d)积温线显著北抬;525mm雨量线明显南压,干暖气候的快速演变是造成该区森林线南移,森林资源锐减的主要气候原因。 |
| 英文摘要: |
| Based on the investigation in 1985 and 1994, and analysing the data of forest resource in 1998, 2000, the result of tendency of shrinking of forest resource in last 30 years,especially in 90s last century was found. The character of main meteorological data in 1971-2000 has been considered. The factor which affects the forest resource are annual accumulated temperature (≥0℃) and precipitation. It is more important to match the rain with heat. The suitable index of precipitation of year is 525 mm, ranging 495555 mm;of annual accumulated temperature (≥0℃) 3 930 (℃·d), ranging 3 555~4 340(℃·d),The line of 3 930(≥0℃) annual accumulated temperature has been moved to north clearly and the line of 500 mm precipitation has been more to south obviously. The tendency of climate changing to dry and warm is the main reason for forest line moving to the south and the forest resource decreasing rapidly. |
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