荒漠灌木梭梭同化枝相对生长速率对温度升高响应的不确定性  

The Uncertainty of Response of Relative Growth Rate of H.Ammodendron Assimilation Twigs to Temperature Increment

作　　者：秦海波[1,2] 郑新军[1] 李彦[1] 马杰[1,2] 李嵩[1,2] 唐立松[1] 

机构地区：[1]中国科学院新疆生态与地理研究所新疆阜康荒漠生态国家野外科学观测研究站,新疆乌鲁木齐830011 [2]中国科学院研究生院,北京100049

出　　处：《中国沙漠》2012年第5期1335-1341,共7页Journal of Desert Research

基　　金：国家杰出青年科学基金(A类)项目(40725002);国家自然科学基金项目(40971042)共同资助

摘　　要：近地表大气和陆表温度的升高已经成为一个不争的事实,同时这种趋势还将持续下去。全球变暖不仅改变了热量条件,还改变了水分条件。水热条件可以综合地反映为潜在蒸散量,进而影响植被生产力,而同化组织是植物对环境变化最为敏感的部位。本研究跟踪梭梭同化枝在2010年6—9月的生长动态,测定同化枝的光响应曲线以计算同化枝潜在同化速率,并利用气象数据及Hargreaves公式计算潜在蒸散量。通过分析梭梭同化枝相对生长速率与潜在同化速率,潜在蒸散量与潜在同化速率之间的数量关系,建立了仅仅需要日最低、最高和平均温度,以及太阳总辐射数据,就可以估算梭梭同化枝相对生长速率的简单方法,经统计检验基本可行(P=0.016)。应用该种方法和1960—2000年6—9月本地月平均气象数据,讨论了在全球变暖背景不同的升温模式下,梭梭同化枝相对生长速率变幅的方向和大小的不确定性,由此表明了荒漠生态系统对全球变化响应的复杂性。It is an indisputable that the near-surface atmospheric temperature and land surface temperature is increasing, and its trend will continue. The global warming not only changes the thermal conditions, but al- so changes the water conditions. The water/thermal conditions can generally reflect the potential evapo- transpiration （ET0）, thereby affect the productivity of vegetation. Assimilation organs of plant are the most sensitive part responding to environmental change. The study tracked the growth dynamics of the H. am- modendron assimilation twigs from June to September in 2010, measured the light-response curve to esti- mate the potential assimilation rate, and calculated ETo by using meteorological data through the Hargreaves equation. The quantitative relationships among H. ammodendron assimilation twigs relative growth rate, ETo and potential assimilation rate of H. ammodendron assimilation twigs were obtained in the research. Based on the relationships, a simple method to estimate the relative growth rate of H. ammodendron as- similation twigs only by using the data of daily average temperature, daily maximum temperature, daily minimum temperature and total solar radiation data was established, and it was tested to be feasible（P = 0. 016）. With the method and local meteorological data from June to September in 1960-2000, the paper discussed the uncertainty of variation direction and magnitude of H. ammodendron assimilation twigs rela- tive growth rate in different temperature increasing modes on global warming background, and the results proved the complexity of the desert ecosystem responding to global change.

关 键 词：全球变暖 梭梭 潜在蒸散量 同化枝 相对生长速率 

分 类 号：Q945[生物学—植物学]