G2TT
来源类型Articles
规范类型论文
ISSN0961-9534
Biomass production and allocation in Jatropha curcas L. seedlings under different levels of drought stress
Dumanski, J.; Desjardins, R.L.; Lal, R.; De Freitas, P.L.; Gerber, P.; Steinfeld, H.; Verchot, L.V.; Schuman, G.E.; Derner, J.D.; Rosegrant, M.
发表日期2010
出处Biomass and Bioenergy 34(5): 667-676
出版年2010
语种英语
摘要

In a greenhouse experiment we applied three levels of drought stress and monitored growth variables and biomass production of Jatropha curcas seedlings propagated from three seed accessions. We determined biomass allocation, allometric relationships and plant traits. Well-watered J. curcas seedlings grew 0.81 ± 0.15 cm day-1 in length and produced 1.49 ± 0.31 g dry biomass day-1. Under medium stress (40% plant available water) the plants maintained a similar stem shape, although they grew at lower rate (stem length: 0.28 ± 0.11 cm day-1; dry biomass production: 0.64 ± 0.18 g day-1). Seedlings under extreme drought stress (no irrigation) stopped growing, started shedding leaves and showed shrinking stem diameter from the 12th day after the start of the drought treatment. The drought treatment did not influence the wood density (0.26 g cm-3). The root/shoot ratio of the wet treatment was 0.27, which is low compared to other tropical trees. Both the biomass allocation and root/shoot were significantly influenced by drought. Plants of the different accessions were uniform in biomass production and plant traits. The allometric relationship predicting total aboveground biomass (B) with the stem diameter (D) (B = 0.029 × D2.33; R2 = 0.89) fits well in universal scaling models in which the exponent is expected to converge to 2.67 at plant maturity. Based on a small validation data set from mature J. curcas individuals this hypothesis could be confirmed. A second regression model predicts the total leaf area (LA) as a function of stem diameter (LA = 2.03 × D2.41; R2 = 0.95). The estimated transpiration crop coefficient Kcb ranged from 0.51 to 0.60 for the well-watered plants.

主题allometry ; leafy vegetables
URLhttps://www.cifor.org/library/3256/
来源智库Center for International Forestry Research (Indonesia)
资源类型智库出版物
条目标识符http://119.78.100.153/handle/2XGU8XDN/91675
推荐引用方式
GB/T 7714
Dumanski, J.,Desjardins, R.L.,Lal, R.,et al. Biomass production and allocation in Jatropha curcas L. seedlings under different levels of drought stress. 2010.
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