Chang Zhao-Feng, Han Fu-Gui, Zhong Sheng-Nian
Minqin National Station for Desert Steppe Ecosystem Studies, Minqin 733300, Gansu, China.
Ying Yong Sheng Tai Xue Bao. 2012 May;23(5):1210-8.
Based on the phenological data in 1974-2009 and the plot vegetation data in 2002-2010 as well as the meteorological data, this paper analyzed the responses of the vegetations in Minqin desert area to climate change. In 1961-2010, the air temperature and air humidity in the study area increased, and the increasing rate of the mean annual air temperature was greater than the global level and China's level over the past century. The responses of the vegetations to the air temperature change were mainly manifested in the advance of spring phenology, delay of autumn phenology, and lengthening of growing duration, whereas the responses of the vegetations to precipitation change were mainly manifested in the decrease of vegetation coverage and pure coverage with the decreasing precipitation. The plant density and richness fluctuated with the variation of precipitation, and the vegetation coverage and pure coverage were positively correlated with the annual precipitation firstly, and the precipitation in Jun-July and in April-May secondly. The plant density and richness were positively correlated with the precipitation in September. The advance of the spring phenology was in the order of bud-expansion > bud-opening > beginning of flowering > beginning of leaf-extension and leaf flourish > flower-bud appearance > flower flourishing > end of flowering > fruit-maturity, whereas the delay of autumn phenology was in the order of full leaf-discoloration > beginning of leaf-fall > beginning of leaf-discoloration > end of leaf-fall. As compared with the increase of air temperature in autumn, the increase of air temperature in spring had greater effects on the plant phenology in Minqin desert area.
基于1974 - 2009年的物候数据、2002 - 2010年的样地植被数据以及气象数据，本文分析了民勤荒漠区植被对气候变化的响应。1961 - 2010年，研究区气温和空气湿度升高，年平均气温升高速率大于过去一个世纪的全球水平和中国水平。植被对气温变化的响应主要表现为春季物候提前、秋季物候推迟、生长季延长，而植被对降水变化的响应主要表现为随着降水量减少，植被覆盖度和纯盖度降低。植物密度和丰富度随降水量变化而波动，植被覆盖度和纯盖度首先与年降水量呈正相关，其次与6 - 7月及4 - 5月的降水量呈正相关。植物密度和丰富度与9月降水量呈正相关。春季物候提前顺序为：芽膨大＞芽开放＞始花＞展叶和叶繁茂始期＞现蕾＞盛花＞花期末＞果实成熟，秋季物候推迟顺序为：全叶变色＞落叶始期＞叶变色始期＞落叶末期。与秋季气温升高相比，春季气温升高对民勤荒漠区植物物候的影响更大。
