BOX 3 Chapters concerning the calculation of crop evapotranspiration under non-standard conditions (ETc adj) PART C ----- Chapter 8 - ETc under soil water stress conditions: This chapter discusses the reduction in transpiration induced by soil moisture stress or soil water salinity. The resulting evapotranspiration will deviate from the crop evapotranspiration under standard conditions. The evapotranspiration is computed by using a water stress coefficient, Ks, describing the effect of water stress on crop transpiration.
Chapter 9 - ETc for natural, non-typical and non-pristine vegetation: Procedures that can be used to make adjustments to the Kc to account for less than perfect growing conditions or stand characteristics are discussed. The procedures can also be used to determine Kc for agricultural crops not listed in the tables of Part B.
Chapter 10 - ETc under various management practices: This chapter discusses various types of management practices that may cause the values for Kc and ETc to deviate from the standard conditions described in Part B. Adjustment procedures for Kc to account for surface mulches, intercropping, small areas of vegetation and management induced stress are presented.
Chapter 11 - ETc during non-growing periods: This chapter describes procedures for predicting ETc during non-growing periods under various types of surface conditions.
非标准条件下作物蒸散计算的章节(ETc adj) C部分 ----- 第 8 章 - 土壤水分胁迫条件下的 ETc: 本章讨论由土壤水分胁迫或土壤水分引起的蒸腾减少 盐度。产生的蒸散量将偏离标准条件下的作物蒸散量。蒸散量是通过使用水分胁迫系数 Ks 来计算的,Ks 描述了水分胁迫对作物蒸腾的影响。
第 9 章 - 自然、非典型和非原始植被的 ETc: 讨论了可用于调整 Kc 以解决不完美的生长条件或林木特征的程序。该程序还可用于确定 B 部分表格中未列出的农作物的 Kc。
第 10 章 - 各种管理实践下的 ETc: 本章讨论了可能导致 Kc 和 ETc 值偏离 B 部分中描述的标准条件的各种类型的管理实践。介绍了 Kc 的调整程序,以考虑地表覆盖物、间作、小面积植被和管理引起的压力.
第 11 章 - 非生长期的 ETc: 本章描述了在各种地表条件下预测非生长期 ETc 的程序。
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