Effect of Lanthanum on Disease Resistance Related Enzymes of Rape

Thegrowthandtheabilitytoresistdiseaseofcropscanbeincreasedbyrareearthelements (REEs)ofsuitableconcentration[1,2 ] .ReportsshowedthatsprayingREEscandecreasethediseaseindexesofin fectedplants .Zhangetalfoundthatthegrowthofapathogenofrapeformingsclerotium (Sclerotiniascle rotiorum )couldbeinhibitedbyREEsofacertaincon centration[3] .ButonlyafewreportshavestudiedthemechanismofthediseaseresistanceinducedbyREEs.EspeciallytheactivityofenzymesrelatedtodiseaseresistanceaffectedbyREEs ,aswellasthe…     

土壤碳库激发效应研究

外源有机质的输入能促进或抑制土壤有机碳的矿化,引起正的或负的激发效应。本文综述了土壤碳库激发效应产生的机制,以及土壤原有有机质的含量和营养水平,外源有机质(包括根系分泌物)的种类和数量对激发效应的影响。外源有机质的可利用率是影响激发效应的最重要因素。     

Effects of Lanthanum on Hydrolytic Enzyme Activities in Red Soil

The effects of La on some hydrolytic enzyme activities in red soil were studied in incubation and pet culture experiments. In the incubation experiment, La slightly stimulates the activities of urease and acidic phosphatase in soil and strongly stimulates sucrase activity in soil. In the pet culture experiment, La stimulates the activities of urease, acidic phosphatase and sucrase to different degrees. The stimulative effects of rare earth elements (REE) on hydrolytic enzyme activities in soil may result in increasing yield of eivps.     

Influence of Exogenous Lanthanum on Fertility Parameters of Red Soil and Paddy Soil

Ｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓ (ＲＥＥｓ)ａｒｅａｂｌｅｔｏｉｎｃｒｅａｓｅｙｉｅｌｄｏｆｃｒｏｐｓａｎｄｉｍｐｒｏｖｅｐｒｏｄｕｃｔｑｕａｌｉｔｙ[1] .Ｉｎｒｅｃｅｎｔｙｅａｒｓ ,ＲＥＥｓｗｅｒｅｗｉｄｅｌｙｕｓｅｄａｓｆｅｒｔｉｌｉｚｅｒｉｎａｇｒｉｃｕｌｔｕｒｅｉｎＣｈｉｎａ[2 ] .Ｃｈｅｎｅｔａｌ.[3] ｒｅｐｏｒｔｅｄｔｈｅｃｏｎｃｅｎｔｒａｔｉｏｎｏｆＲＥＥｓｉｎｖａｒｉｏｕｓｓｏｉｌｌａｙｅｒｓｉｎｃｒｅａｓｅｄｓｉｇｎｉｆｉ ｃａｎｔｌｙｉｎｃｏｍｐａｒｉｓｏｎｗｉｔｈｔｈａｔｉｎｔ…     

Effect of Lanthanum on Nitrification, Phosphorus Transformation and Phenol Decomposition in Red Soil

The effect of La on nitrification, P transformation and phenol decomposition in red soil was studied by incubation and pot culture experiments. La at low concentration has stimulative effect on soil nitrification and P transformation while its high concentration has inhibitory effects, and the inhibition is strengthened with increasing concentration of La. La has strongly inhibitory effect on soil phenol decomposition and the inhibition is strengthened with increasing concentration of La. When the incubation time is prolonged, the inhibitory effect of La on soil nitrification and phenol decomposition tends to decrease.     

镧对太湖地区水稻土若干水解酶活性的影响

通过模拟试验研究了镧对太湖地区水稻土酸性磷酸酶、脲酶及蔗糖酶活性的影响。镧对水稻土酸性磷酸酶活性表现出抑制作用 ,当镧浓度大于 6 0 mg/kg时 ,抑制作用达到显著水平 ,最大抑制率达到 13%;镧对水稻土脲酶活性影响不显著 ;镧对水稻土蔗糖酶活性表现出一定的刺激作用 ,当镧浓度为 30 0 mg/kg时 ,刺激作用达到显著水平 ,最大刺激率为 10 %。     

外源镧在红壤中的有效性及其对土壤酸度的影响

通过培养试验及盆栽试验研究了外源镧在红壤中的有效性及其对土壤酸度的影响。结果表明,土壤有效态镧随外源镧的增加而增加,两者呈显著的正相关;外源镧在土壤中具有较高的有效性,随着时间的延长有效性逐渐降低;土壤pH随外源镧的增加不断降低,pH和外源镧及有效态镧均呈显著的负相关;过量的镧对土壤生态环境将产生破坏作用。     

Effect of Lanthanum on Rice Growth and Physiological Parameters with Split-Root Nutrient Solution Culture

Ａｌｏｔｏｆｗｏｒｋｈａｓｂｅｅｎｄｏｎｅｏｎｔｈｅｅｆｆｅｃｔｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓｏｎｐｌａｎｔｇｒｏｗｔｈａｎｄｐｈｙｓｉｏｌｏｇｉｃａｌａｃｔｉｖ ｉｔｉｅｓ .ＲｅｓｕｌｔｓｈａｖｅｓｈｏｗｎｔｈａｔＲＥＥｓａｐｐｌｉｅｄｂｙｆｏｌｉａｒｓｐｒａｙｓ ,ｓｅｅｄｔｒｅａｔｍｅｎｔｓｏｒａｄｄｉｔｉｏｎｔｏｔｈｅｓｏｉｌｓａｎｄｓｏ ｌｕｔｉｏｎｍｅｄｉａｃａｎｉｎｃｒｅａｓｅｇｒａｉｎｃｒｏｐｓ ,ｅｃｏｎｏｍｉｃｃｒｏｐｓ ,ａｎｄｖｅｇｅｔａｂｌｅｓｂｙ 5 0 %～ 12 % ,8 0 %…     

Effects of Lanthanum on Microbial Biomass Carbon and Nitrogen in Red Soil

Ｉｔｈａｓｂｅｅｎｍｏｒｅｔｈａｎ 2 0ｙｅａｒｓｓｉｎｃｅｒａｒｅｅａｒｔｈｓ (ＲＥ)ａｒｅａｐｐｌｉｅｄｉｎａｇｒｉｃｕｌｔｕｒｅ .Ｄｕｒｉｎｇｌａｓｔｙｅａｒｓ ,ｔｈｅａｃｃｕｍｕｌａｔｉｏｎｏｆＲＥｉｎｓｏｉｌｓｗａｓａｃｃｅｌｅｒａｔｅｄｂｅｃａｕｓｅＲＥ ＮＨ4ＨＣＯ3 ｃｏｍｐｌｅｘｆｅｒｔｉｌｉｚｅｒｓｗｅｒｅｅｘｔｅｎｓｉｖｅｌｙａｐｐｌｉｅｄａｎｄｄｉｒｅｃｔｌｙｕｓｅｄｉｎｓｏｉｌｓ[1] ,ｓｏｔｈｅｒｅｉｓａｇｒｏｗｉｎｇｃｏｎｃｅｒｎａｂｏｕｔｔｈｅａｄｖｅｒｓｅｅｆｆｅｃｔｏｆ…     

大气CO2浓度升高对陆地生态系统土壤固碳的可能影响

陆地生态系统碳循环是伞球碳循环的重要组成部分,在全球碳收支中占主导地位.大气CO2浓度升高直接或间接地影响土壤碳的固定,碳在土壤的不同固定机理反映了碳的稳定性和周转过程,本文综述了影响碳固定的物理、化学和生物学机理,土壤碳固定的不同状态发生的主要机理不同;受大气CO2浓度升高影响时间长短不一,主要过程有所侧重,但三种机理相互影响.