DB22T 3404-2022 玉米气候年景评价规范

22EvaluationstandardsformaizeannualaI本文件按照GB/T1.1—2020《标准化工作导则第1部分：标准化文件的结构和起草规则》的规定1玉米气候年景评价规范GB/T20481—2017气象干旱GB/T21986—2008农业气候影响评价：农作物气候年型划分方法GB/T33670—2017气候年景评估农业气象要素agrometeorologicalel注：本文件将玉米从播种到成熟划分为五个生育阶段，分别为播种至出苗玉米气候年景maizeannualagriculturecli玉米气候年景等级gradeofmaizeannualagriculturecli24适宜度指数计算4.1温度适宜度指数fij(T)[(TTl)(ThT)B]/[(ToTl)(ThTo)B]·········································(1)fij(T)——第i个生育阶段第j天温度T时的温度适宜度指数，i取1-5，j随生育阶段变化；Tl——生长发育的下限温度（日平均气温），单位为℃,若T≤Tl，则fijT0；h——生长发育的上限温度（日平均气温），单位为℃,若T≥Th，则fijT0；），4.1.2某生育阶段温度适宜度指数按公式（2）计算。nifi(T)ni1fij(T)···································································(2)fi(T)——第i个生育阶段温度适宜度指数；4.1.3玉米整个生育阶段温度适宜度指数按公式（3）计算。5f(T)aitfi(T)·································································(3)f(T)——整个生育阶段温度适宜度指数；ait——第i个生育阶段温度适宜度指数权重系数，计算方法见附录C。4.2降水适宜度指数4.2.1某生育阶段降水适宜度指数按公式（4）计算。P/P0fi(P)1P0/P/P030%/P030%········································/P030%3fi(P)——第i个生育阶段降水适宜度指数；P——生育阶段的累积降水量，单位为毫米（mm）；P0——生育阶段累积降水量气候平均值（当地近30），），4.2.2玉米整个生育阶段降水适宜度指数按公式（5）计算。5f(P)aipfi(P)·································································(5)f(P)——整个生育阶段降水适宜度指数；aip——第i个生育阶段降水适宜度指数权重系数，计算方法见附录C。e[(SS0)/b]2SS1Se[(SS0)/b]2SS1SS0fij(S)——第i个生育阶段第j天日照时数S时的日照适宜度指数；S0——日照时数临界值，单位为h，取可照时数的70%，取值见附录B，可照时数按照GB/Tb——经验常数，随生育阶段的变化而变化，4.3.2某生育阶段日照适宜度指数按公式（7）计算。fi(S)ni1fij(S) fi(S)——第i个生育阶段日照适宜度指数。4.3.3玉米整个生育阶段日照适宜度指数按公式（8）计算。5f(S)aisfi(S)·································································(8)4f(S)——整个生育阶段日照适宜度指数；is——第i个生育阶段日照适宜度指数权重系数，计算方法见附录C。Zatf(T)apf(P)asf(S)··················································(9)ap——降水适宜度指数权重系数；as——日照适宜度指数权重系数。6.1应采用30年以上的玉米气候年景指数值，按百分），1好丰＜Z2＜Z≤P903平＜Z≤P704＜Z≤P305差歉Z≤P105参数B的计算方法参数B按公式A.1计算。B(ThTo)/(ToTl)··········），），T），6