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主要研究Ｃｒ６＋污染对水鳖的外部形态及叶绿素含量、过氧化物酶活性、硝酸还原酶活性等生理指标的影响．Ｃｒ６＋对水鳖毒害结果显示是抑制其对水分的吸收，在８～３２μｇ／ｇ范围内毒害程度与处理时间和浓度呈正相关．在高浓度时短期处理的叶边缘开始出现干枯，根尖腐烂．在短期内４μｇ／ｇ，８μｇ／ｇ的Ｋ２Ｃｒ２Ｏ７能提高水鳖叶中叶绿素的含量，而１６μｇ／ｇ，３２μｇ／ｇ的Ｋ２Ｃｒ２Ｏ７则降低叶中叶绿素的含量．过氧化物酶活性则随着处理浓度的升高而升高．硝酸还原酶的活性在短期内４μｇ／ｇ最高，８μｇ／ｇ也略高于对照．１６μｇ／ｇ，３２μｇ／ｇ时活性降低
The main research Cr6 pollution on the external morphology and chlorophyll content, peroxidase activity, nitrate reductase activity and other physiological indicators. The results of poisoning of Trichosanthes spp. Showed that Cr6 + inhibited the water absorption, and the degree of toxicity was positively correlated with the treatment time and concentration in the range of 8 ~ 32μg / g. At high concentrations, short-term treatment of leaf edge began to appear dry, apical decay. In the short term, K2Cr2O7 at 4μg / g and 8μg / g increased the content of chlorophyll in watermelon leaves, whereas K2Cr2O7 at 16μg / g and 32μg / g decreased chlorophyll content. Peroxidase activity increased with the increase of treatment concentration. Nitrate reductase activity in the short term 4μg / g highest, 8μg / g also slightly higher than the control. 16μg / g, 32μg / g activity decreased