• 研究报告 •

### 辽东山区次生林林窗内秋季最低温度的时空分布特征

1. 1沈阳农业大学， 沈阳 110866； 2中国科学院沈阳应用生态研究所， 沈阳 110016； 3中国科学院清原森林生态系统观测研究站， 沈阳 110016； 4辽宁省气象装备保障中心， 沈阳 110166）
• 出版日期:2016-06-10 发布日期:2016-06-10

### Spatiotemporal distribution of minimum temperature during autumn at different slope aspects of secondary forest gap in montane zone of eastern Liaoning Province.

ZHU Cheng-yao1,3, WANG Yi3,4, LI Xiu-fen1,3*, LIU Jiang1, ZHANG Jin-xin2,3, WANG Tao1,3#br#

1. (1Shenyang Agricultural University, Shenyang 110866, China; 2Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3Qingyuan Forest CERN, Chinese Academy of Sciences, Shenyang 110016, China; 4Liaoning Provincial Meteorological Equipment Support Center, Shenyang 110166, China).
• Online:2016-06-10 Published:2016-06-10

Abstract: Aiming to determine the change pattern of early frost in gaps of secondary forest ecosystem in montane zone of eastern Liaoning Province, the spatiotemporal distribution characteristics of the minimum temperature in forest gaps during autumn at different slope aspects were analyzed in this study. The results showed that there was a significant difference in the minimum temperature among gaps at three slopes (P<0.01). The highest values of minimum temperature occurred at the northeast slope in September (-4.61 ℃) and the highest values occurred at the northwest slope in October (-7.24 ℃). No significant difference was found in the minimum soil temperature at 5 cm depth among gaps at the three slopes (P>0.05). The lowest values of minimum soil temperature in September and October occurred in the northwest (4.87 ℃) and southeast (2.05 ℃) slope gaps, respectively. The spatial distribution of minimum air temperature in gaps and minimum soil temperature at 5 cm depth varied asymmetrically with time, and the high-value area existed at the gap edge. In early autumn (before 28 September), the minimum air temperature of the northwest slope and the northeast slope within gaps were higher than that of the southeast slope. In late autumn, however, the minimum air temperature of the northwest slope was the highest, and that of the northeast slope was the lowest. In addition, the air temperatures within gaps fell below 0 ℃ just after the early autumn, and the differences of the air temperature between different slope aspects were greater than those in the early autumn. Compared with the minimum air temperature, the minimum soil temperature was much higher, with smaller fluctuation, but their daily variation was similar. All these results indicated that the minimum air and soil temperatures within gaps varied with slope aspects, positions within gaps and time. The minimum air and soil temperatures influenced the frost dynamics and its level of damage. Thus, better understanding the spatiotemporal distribution of the minimum air and soil temperatures within gaps played a critical role in forest regeneration and succession.