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邓建明,张晓艳,王根轩,魏小平,赵长明.不同水分条件下春小麦能量利用与密度的关系.生态学报,2006,26(7):2281~2287 本文二维码信息
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不同水分条件下春小麦能量利用与密度的关系
The relationship between the energy use and densities of spring wheat under the different moisture levels
投稿时间:2005-03-14  修订日期:2006-02-28
DOI:
关键词能量利用  叶面积指数  密度  叶面积系数  干旱  能量守衡
Key Wordsleaf area indexes  density  drought  energy law  leaf area coefficient
基金项目
作者单位
邓建明 兰州大学干旱与草地农业生态教育部重点实验室兰州 730000 
张晓艳 兰州大学干旱与草地农业生态教育部重点实验室兰州 730000 
王根轩 兰州大学干旱与草地农业生态教育部重点实验室兰州 730000; 浙江大学生命科学学院杭州 310029 
魏小平 兰州大学干旱与草地农业生态教育部重点实验室兰州 730000 
赵长明 兰州大学干旱与草地农业生态教育部重点实验室兰州 730000 
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摘要:
密度制约是植物种内竞争效应之一。叶面是植物与外界环境交换物质、能量的有效渠道之一,叶面积指数是植物种群资源利用率和维系植物碳平衡的重要指标。以叶面积指数为测度,测定不同土壤水分条件下叶面积指数与密度间的关系来判定春小麦有效能量利用与密度间的关系,并得知小麦在营养生长期(抽穗期以前)各水分条件下的叶面积指数均随种植的密度递增,而在抽穗期叶面积指数明显下降,在高密度区(4000~10000)尤为明显,且密度1000~10000的叶面积指数趋于稳定。从拔节期到成熟期水分条件正常的叶面积指数比干旱处理的明显要高,而且主要表现在高密度区,但是它们的变化趋势基本一致。结果表明春小麦的穗粒数、千粒重和产量的变化趋势也是和叶面积指数一致的,这充分反映了叶面积指数与植物种群资源利用率或生物量有着密切的关系,同时表明干旱胁迫抑制了植物群落的能量利用。因此,对植物叶面积的研究将对探讨植物物质能量交换的平衡规律具有重要的意义。
Abstract:
The density restriction is one of population competition effects. Leaves are the critical organs for plants to exchange matter and energy with the outside environment. Therefore, the leaf area index (LAI) is an important parameter to describe how plant populations use the resources and maintain a positive carbon balance. Therefore, the present paper takes into account the density, leaf area coefficient and leaf area index of spring wheat as the major variables and measures the relationship between the density and the leaf area index under two different soil water content levels (i.e. the Drought treat and the Control). The sowing density gradient is designed as 1,10,100,1000,4000,10000m-2 at each soil moisture level. Our experiment results are as follows: (1) the actual density of the populations with the sowing density of 1000m-2 is consistent from three-leaf stage to ripening stage under both the Drought treatment and the Control, but those with the sowing density 4000~10000m-2 begin to decline rapidly after elongation stage, i.e. accruing self-thinning; (2) the leaf area indexes of spring wheat increase with the increase of sowing density under two soil moisture levels during the nutritional growing period (i.e. before the heading stage); (3) but the leaf area indexes begin to drop obviously in the heading stage, especially in the high density regions (4000~10000m-2),and the leaf area index curves tend to smoothen from sowing density1000 to 10000 (the LAI is about 8 and 12 under the Drought treat and the Control, respectively); (4) from elongation stage to the ripening stage, the leaf area indexes of the Control is notably higher than that of the Drought, especially in the high density region, however, their trends of change are similar; (5) the trends of the number of grains per tiller, 1000-grain-weight and yield for each sowing density accord with the LAI under different moisture conditions. Our results show that the LAI can reflect the situation of the rate of resource use by plants or the biomass in plant population, at the same time. The variation in LAI also shows how the drought stress restrains the plant population from using energy. Therefore, examination of the leaf area index of plants has significance in exploring the balance law of matter and energy.
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