铜锌交互作用和土壤γ-辐射对大麦和黑麦草生长的影响   总被引：3，自引：1，他引：3  

骆永明  严蔚东  Peter Christie 《土壤》2000,32(2):95-98

盆栽试验结果表明，在外加铜１００ｍｇｋｇ＾－１和锌１５０ｍｇｋｇ＾－１时，铜锌交互作用可提高其毒性，使大麦和黑麦草生物量显减少和土壤铜锌临界限值降低。土壤γ－辐射可促进金属单一或复合污染及对照土壤上大麦和黑麦草生长而增产，但在外源铜污染时，植物受害，生物量显减少，黑麦草对Ｃｕ的敏感性高于春大麦。在制定土壤金属污染标准时应考虑金属交互作用和土壤消毒作用的效应。  相似文献   

太湖地区不同土壤-森林生态系统中林木生长对微量元素的反应及反馈效应     

ZHANG Huan-Chao  CAO Zhi-Hong  HU Zheng-Yi  XU Hong-Qiang  YU Yuan-Chun  XU Bo-Zhong  XIAO Xin-Fang 《土壤圈》2001,11(4):311-320

Vector analysis technique and ecological sequential comparison methods were adopted to study tree growth response to the micronutrients,B,Mo,Cu,Zn,Fe,and Mn,in soils derived from various parent materials in the forest area of Tailhu Lake region in southeast China,The results showed that the dry weight of individual current-year needle of Chinese fir(Cunninghamia lanceolata) grown on the soil derived from granite parent rock was increased by 8% and 13% in comparison with that grown on the soils derived from sandstone and ash-tuff parent rock,respectively.And such dry weight of loblolly pine (Pinus taeda) grown on the soil derived from sandstone parent rock was increased by 21% in comparison with that on the soil derived from ash-tuff parent rock.One of the reasons for those results was that micronutrients content in the soil derived from ash-tuff parent rock were not sufficient to meet the requirement of the growth of Chinese fir and loblolly pine ,i.e.,micronutrients in soil were deficient and/or induced defiient.The amounts of Cu,Zn,Fe,and Mn uptake by Chinses fir and loblolly pine were in agreement with the contents of available micronutrients in soil respectively,except for B and Mo.Meanwhile,there might exist and “antagonism“ between the uptake of B versus Mo by trees,although more studies are needed to confirm it .Regression analysis indicated that amount of a soil available micronutrient was correlated to the type of parent material and its total amount in the forest floor, except for B.The F test identified that the correlation of each equation reached the significant level to different extents,respectively,The t test confirmed that amount of available forms was mainly depended on the type of parent material for Mo,Cu,Zn and Mn but on the forest floor for ,Fe,There was a feedback effect of forest stand on the amount of soil available micronutrients.The ability of accumulating available micronutrients in soil was better by the sawtooth oak(Quercus acutissima) stand than by the Chinese fir stand (except for B).The ability of accumulating available Zn,Fe,Mn and Mo in soil was better by the Chinese fir stand than by the loblolly pine stand ,while as for available B and Cu,by the latter was better than by the former,When discussing the efect of forest stand on the amount of soil available micronutrients,not only the amount of micronutrient in the forest floor and the parent materials but also the amount of micronutrient taken up by current-year needles have to be considered.  相似文献   

以户单元的“猪—沼—酒”富民庭院生态经济模初探     

徐效俊  李在田等 《农业环境与发展》2002,19(1):14-14

  相似文献   

根－土界面区域磷酸盐的分布和移动: Ⅱ. 土壤水分含量和磷酸盐施用量的影响     

XU Ming-Gang  ZHANG Yi-Ping  SUN Ben-Hua 《土壤圈》1995,5(3):267-274

The phosphate in the soil-root interface zone under various soil water contents and application rates of phosphate was still of depletion distribution which could be described by a power function in the form of C/Co= ax^b(C/Co is the relative content of fertilized phosphate in a distance from the root surface x, a and b are the regression constants). The depletion rate of phosphate in soil near the root surface was higher and the depletion range was narrower under lower soil moisture. On the contrary, at higher soil water content the depletion range was wider, generally. The application rate of phosphate led to the greater depletion intensity of phosphorus was higher in the heavier texture soils. In general, the depletion intensity in the soils, which decreased with increasing clay content or increasing buffering power of soil, decreased in the order as loessal soil and black lou soil > lou soil > yellow cinnamon soil when 50 or 100 mg of phosphorus were applied in the form of KH₂PO₄. This result indicated that the phosphate distribution and its movement in the soil-root interface zone closely related with the buffering capacity of soil.  相似文献   

农杆菌介导法将β—1,3—葡聚糖酶基因导入油菜的研究初报   总被引：16，自引：2，他引：16  

蓝海燕  陈正华 《中国油料作物学报》2000,22(1):6-10

将克阼的烟草β－１,３－葡聚糖酶基因插入双子叶植物高效表达载体ｐＢｉｎ４３８中,构建了植物表达载体ｐＢＬＧ。利用农杆菌介导法,将此抗真菌基因导入甘蓝型双低油菜品种Ｈ１６５中,得到了抗卡那霉素的再生植株,并探讨了影响油菜分化的几个要素。结果表明：乙酰丁香酮及硝酸银等物质对油菜分化及绿苗的形成具有重要作用; 采对卡那霉素十分敏感,提高卡那霉素浓度可可能将一部分转化体淘汰,对８株再生株株进行了ＰＣＲ检测  相似文献   

红茶萎凋发酵中β—葡萄糖苷酶的活性变化   总被引：11，自引：4，他引：11  

夏涛  童启庆 《茶叶科学》1996,16(1):63-66

β－葡萄糖苷酶是鲜叶中香气前体物质－糖苷转化为游离香气的关键酶。对红花萎凋、发酵过程中β－葡萄糖苷酶活性的变化动态研究结果表明，在萎凋期间，酶活性是逐步增强的，綦知性达鲜叶的２－２．５倍，且胺萎凋温度和萎凋程度的影响；在发酵进程中，酶活性迅速下降，且发酵温度越高，其活性下降越大。  相似文献   

40—1菌防治茶尺蠖和油桐尺蠖的研究   总被引：1，自引：0，他引：1  

陈涛  雷泽声 《茶叶通讯》1990,(2):19-20

利用昆虫病原微生物防治茶树害虫,苏云金杆菌是最有竞争能力的。在国外,苏云金杆菌虽大量生产和应用,但未见防治茶树害虫的报道。1983年以来,从已有和新分离的菌株中,筛选出对茶毛虫和茶尺蠖毒力较高的40—1菌。1985～1986年,在茶园中应用40—1菌进行了防治茶树主要害虫茶尺蠖、油桐尺蠖的试验,现将结果报道如下。材料和方法1.材料菌剂:40—1粉剂,含40亿芽孢/克  相似文献   

玉米br—2矮生基因利用的研究报告     

崔绍平  孙世珍 《河北农作物研究》1989,(4):8-13

  相似文献   

优质红绿茶兼用品种78-35选育研究     

陈年生  谢桂生  聂樟清  曹挥华  艾丽静  张贱根 《茶叶》2001,27(4):15-20

78-35是江西省蚕桑茶叶研究所的科研人员于1978年春，从群体茶园自然变异体中单株选择，无性繁殖培育成的新品种，经品系比较，性状鉴定，生化分析，适制性研究和生产试验示范，表明具有发芽早，芽叶茸毛多，适制银针，毛峰类名茶和大宗绿茶、红茶、产量高且品质优；抗寒性强，抗病虫能力也较强以及适应性广的优点。  相似文献   

橡胶树HMG-CoA还原酶基因结构序列分析   总被引：4，自引：0，他引：4  

黄俊生  孔德謇 《热带作物学报》1996,17(2):5-10

橡胶树ＨＭＧ－ＣＯＡ还原酶ｃＤＮＡ序列分析结果表明，该ｃＤＮＡ长段为１３８３ｂｐ，由此推导的氨基酸序列含有４６１个氨基酸残基。ＰＣＧＥＮＥ￣（ＴＭ）分析该ｃＤＮＡ克隆与拟南芥ＨＭＧ－ＣｏＡ还原酶ｃＤＮＡ序列同源性为７９．７％，氨基酸序列同源性为８０．２％，与苍鼠氨基酸序列同源性为５１％，与血吸虫氨基酸序列同源性为４８％。（１）发现ＨＭＧ－ｏｎＡ还原酶的一级结构在动物与植物之间存在较大的差异。（２）分析ＨＭＧ－ＣｏＡ还原酶的疏水性氨基酸图谱，发现橡胶树和拟南芥这两种植物权有１个跨膜势能区域（Ｄｏｍａｉｎ），而血吸虫、苍鼠、果蝇等几种动物却有７个跨膜势能区域，这说明该酶的二级结构在动植物之间也存在着较大的差异。（３）由于所分析的几种动植物ＨＭＧ－ＣｏＡ还原酶的羧基一端未见有疏水性区域，故推测具有疏水性区域Ｎ－端蛋白质与膜相结合，而酶的羧基端由于具有亲水性则起到酶的催化中心位点。（４）比较橡胶树ＨＭＧ－ＣｏＡ还原酶和拟南芥ＨＭＧ－ＣｏＡ还原酶氨基酸同源性，发现蛋白质（酶）的Ｎ－端氨基酸同源性较低，而靠近Ｃ－端同源性较高，这说明Ｃ－端部分较为保守，估计与酶的活性中心区域有关，而Ｎ－端同源性较差，估计跟酶与结合的膜不  相似文献