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- W2386814588 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." @default.
- W2386814588 created "2016-06-24" @default.
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- W2386814588 date "2006-01-01" @default.
- W2386814588 modified "2023-09-25" @default.
- W2386814588 title "The relationship between the energy use and densities of spring wheat under the different moisture levels" @default.
- W2386814588 hasPublicationYear "2006" @default.
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