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首页> 外文期刊>International Journal of Biometeorology: Journal of the International Society of Biometeorology >Quantifying the thermal heat requirement of Brassica in assessing biophysical parameters under semi-arid microenvironments
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Quantifying the thermal heat requirement of Brassica in assessing biophysical parameters under semi-arid microenvironments

机译：在半干旱微环境下量化芸苔的热能需求以评估生物物理参数

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Evaluation of the thermal heat requirement of Brassica spp. across agro-ecological regions is required in order to understand the further effects of climate change. Spatio-temporal changes in hydrothermal regimes are likely to affect the physiological growth pattern of the crop, which in turn will affect economic yields and crop quality. Such information is helpful in developing crop simulation models to describe the differential thermal regimes that prevail at different phenophases of the crop. Thus, the current lack of quantitative information on the thermal heat requirement of Brassica crops under debranched microenvironments prompted the present study, which set out to examine the response of biophysical parameters [leaf area index (LAI), dry biomass production, seed yield and oil content] to modified microenvironments. Following 2 years of field experiments on Typic Ustocrepts soils under semi-arid climatic conditions, it was concluded that the Brassica crop is significantly responsive to microenvironment modification. A highly significant and curvilinear relationship was observed between LAI and dry biomass production with accumulated heat units, with thermal accumulation explaining E80% of the variation in LAI and dry biomass production. It was further observed that the economic seed yield and oil content, which are a function of the prevailing weather conditions, were significantly responsive to the heat units accumulated from sowing to 50% physiological maturity. Linear regression analysis showed that growing degree days (GDD) could indicate 60-70% variation in seed yield and oil content, probably because of the significant response to differential thermal microenvironments. The present study illustrates the statistically strong and significant response of biophysical parameters of Brassica spp. to microenvironment modification in semi-arid regions of northern India.
机译：芸s属植物的热量需求评估。为了了解气候变化的进一步影响，需要跨农业生态区域。热液模式的时空变化可能会影响作物的生理生长方式，进而影响经济产量和作物质量。这些信息有助于开发作物模拟模型，以描述在作物的不同表相普遍存在的差异热态。因此，目前缺乏关于分枝微环境下芸苔属作物热能需求的定量信息促使了本研究，该研究着手研究生物物理参数的响应[叶面积指数（LAI），干生物量生产，种子产量和油脂内容]以修改微环境。在半干旱气候条件下，在典型的Ustocrepts土壤上进行了2年的田间试验后，得出的结论是，芸苔属作物对微环境的改变有明显的反应。在LAI和具有累积热量单位的干生物量生产之间观察到高度显着的曲线关系，其中热累积解释了LAI和干生物量生产中E80％的变化。进一步观察到，经济种子的产量和含油量是当前天气条件的函数，对播种至生理成熟度达到50％时积累的热量单位有明显的响应。线性回归分析表明，生长天数（GDD）可能表明种子产量和油含量变化60-70％，这可能是由于对不同的热微环境有明显的反应。本研究说明了芸s属植物生物物理参数的统计学上强而显着的响应。印度北部半干旱地区的微环境改造。

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