利用生态参数估算水稻作物水分胁迫

M. Saifullah, Bilal Islam
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引用次数: 6

摘要

世界上大约一半的人口以大米为主食。水稻作为水宝宝,需要大量的水分才能达到目标产量。水资源短缺已经成为一个全球性的问题,因此需要通过减少水资源来提高水稻产量。本研究采用温度、气压、实际蒸汽压、日照时数和地外辐射等生态参数,逐日计算净辐射、地面和感热通量。在水稻全生育期(RGP),净短波辐射为23087 w/m2,而净长波辐射为4387 w/m2。土壤热通量Go为3104 w/m2。Go与叶面积指数(LAI)呈负相关关系。整个RGP的感热通量(H)为1771 w/m2。H的观测依赖于净辐射,两者之间有直接关系。以Rn、Go和H为输入参数,计算水稻作物生长初期水分过剩和成熟期缺水的水分胁迫。该方法流程易于应用于国内稻田水分胁迫的测定。
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Estimation of Water Stress on Rice Crop Using Ecological Parameters.
About half of world’s population intake rice as a staple food. As being water baby, rice need surplus of water to get targeted yield. Water scarcity has become a global issue therefore it has become a need to enhance the rice yield with reduced amount of water. In this research we used ecological parameters e.g., temperature, pressure, actual vapor pressure, sunshine hours and the extraterrestrial radiation to compute net radiations, ground and sensible heat fluxes on daily basis. Net shortwave radiations were observed as 23087 w/m2 in comparison to net longwave radiations which were 4387 w/m2 for the complete Rice Growth Period (RGP). The soil heat flux Go was observed as 3104 w/m2. Go was observed dependent upon the Leaf Area Index (LAI) with inverse relationship between them. Sensible heat flux (H) was measured as 1771 w/m2 throughout the RGP. H was observed dependent upon net radiations with a direct relationship between them. Rn, Go and H were used as input parameters to compute water stress which determines the excess of water in early growth stages of rice crop and water scarcity in the ripening stage. The flow of methodology is easily applicable at domestic level to determine water stress in rice fields.
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