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wanfuping
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RXMCDM: ½ð±Ò+1, ¶àлӦÖú£¡ 2014-09-22 08:34:02
ѾѾһÃ×Ñô¹â(RXMCDM´ú·¢): ½ð±Ò+4, ¶àлӦÖú£¡ 2014-10-18 11:16:39
RXMCDM: ½ð±Ò+1, ¶àлӦÖú£¡ 2014-09-22 08:34:02
ѾѾһÃ×Ñô¹â(RXMCDM´ú·¢): ½ð±Ò+4, ¶àлӦÖú£¡ 2014-10-18 11:16:39
| Based on rainfall data collected during growing season from July to September,2013, trunks flow characteristics of 4 typical tree species in cold temperate zone-larch, white birch, aspen and Mongolian oak, and corresponding influence factors were comprehensively analyzed in this paper. The results have shown that: (1) the atmospheric rainfall in this region is 522.7¡¢498.1mm, single average rainfall 24.9¡¢23.7mm, single maximum average rainfall 102.3¡¢96.1mm, single minimum average rainfall 2.2¡¢2.6mm, and the maximum rainfall in July is 258.1¡¢240.6mm; (2) under different disturbing levels, the mathematic relation between penetrated rainfall and overall rainfall in larch forest is quadratic function, and mathematic relations between trunks flow and overall rainfall is quadratic function , as well for 3 kinds of forests besides aspen forest, where the same mathematic relation is power exponent function, and for all 4 cases, penetrated rainfall and trunks flow increase with increasing of overall rainfall; (3) the overall rainfall and change of tree species affect trunks flow of 4 kinds of trees greatly, and the change rules between month change of trunks flow and change of rainfall for 4 different tree species are different; (4)multivariate regression analysis is conducted for analyzing the relation between trunks flow and crown-shaped structure, and these functions¡¯ multiple correlation coefficients are 0.458~0.658, and relation between trunks flow and crown-shaped structure is looser than one between trunks flow and overall rainfall. |
2Â¥2014-09-21 23:26:50













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