氮素供应对土壤酶活性及设施番茄生理抗性和产量的影响  

Effect of N Application Rate on Soil Enzyme Activities,Physiological Activities and Yield of Tomato

作　　者：沙海宁[1] 孙权[1] 周明[1] 郭洁[1] 张晓娟[1] 

机构地区：[1]宁夏大学农学院,宁夏银川750021

出　　处：《北方园艺》2010年第7期9-11,共3页Northern Horticulture

基　　金：国家"十一五"科技支撑计划资助项目(2007BAD57B04)

摘　　要：以土壤酶活性及保护酶系统作为反馈指标,以产量为最终评价因素,探讨宁夏设施栽培条件下,氮素胁迫对土壤生境及植株生理抗性的影响。结果表明:除过氧化氢酶外,供氮量对土壤酶活性影响显著,其中,土壤蔗糖酶活性随施氮量增加而极显著下降,土壤磷酸酶和脲酶活性在低氮供应下增高,高氮供应下(>600 kg/hm2)遭胁迫;设施番茄体内保护酶系统对氮肥施用量反应敏感,适量施氮CAT活性显著回升,但高施氮量(>600 kg/hm2)胁迫使番茄SOD、CAT和POD活性显著下降,而PRO活性显著增加。施氮量的差异最终显著影响番茄产量,供试条件下,设施番茄最高产量施氮量为479.41 kg/hm2,最大利润施氮量为364.71 kg/hm2。Soil and plant enzyme activities, as well as yield of tomato were adopted to evaluate the influence of Nitrogen over application on soil and tomato. The results showed that N application significantly effects soil enzyme activities except soil calalase. Invertase activity was significantly decreased along with increased N application rate. Phosphatase and urease activity were increased under low N application rate, yet severe restrained under high amount of N application （〉600 kg/hm2）. The inner protective enzyme system was sensitive to N application. Reasonable N application rate stimulate catalase of tomato. High rate of N application（〉600 kg/hm2） severe reslricl SOD, CAT and POD activities, but significantly promote Pro activity. Tomato yield was significantly effected by N application. The maximum N application rate for the highest yield of lomato was 479.41 kg/hm2. The reasonable application rate for the highest prOfit yield of tomato was 364.71 kg/hm2.

关 键 词：设施 氮素供应 生理抗性 酶活性 番茄 

分 类 号：S641.201[农业科学—蔬菜学]