作物对盐分的吸收及其盐害的预测预报

通过温室和田间试验，研究小麦和甜菜在盐胁迫下的生长及其对盐分的吸收。结果表明，小麦耐热略低于甜菜，Ｎａ＾＋抑制小麦和甜菜对Ｋ＾＋和Ｃａ＾２＋的吸收，小麦和甜菜的相对干物质重与土壤含盐量的关系符合Ｍａａｓ－Ｈｏｆｆｍａｎ模型，小麦和甜菜叶Ｎａ＾＋含量与土壤含盐量呈显著正相关，且与干物质重的关系也符合Ｍａａｓ－Ｈｏｆｆｍａｎ模型，文中提出了利用作物叶的Ｎａ＾＋含量与相对干物质重之间的Ｍａａｓ－Ｈｏｆｆ

SALT UPTAKE OF CROPS AND THE PREDICTION OF SALT INJURIES TO CROPS

The growth of wheat and sugar beet under salt stress and their uptake of salt were studied through greenhouse and field experiments. The salt tolerance of wheat was lower than that of sugar beet. Na⁺ inhibited the uptake of K⁺ and Ca²⁺.The relations between relative dry weight of wheat and sugar beet and soil salt content confirmed to the Maas-Hoffman model. Na⁺ contents in leaves of wheat and sugar beet had positive linear relations with the salt content of soil. Their relations with the relative dry weight of the crops also confirmed to the Mans-Hoffman model. According to these results, on the basis of Maas-Hoffman model between the Na⁺ content in leaves and the relative dry weight of crop, a method for the dynamic monitoring, diagnosis and prediction of salt injuries to crops was proposed. The predicted results about salt injuries to wheat and sugar beet in fields are satisfactory by this method.