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   土壤速效p 在 环境科学与资源利用 分类中 的翻译结果: 查询用时:0.059秒
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土壤速效p
相关语句
  soil readily available p
    There is very significant and positive correlation between the contents of soil readily available P in the layer B and ecological dominance of the community.
    B层土壤速效P的含量与群落生态优势度呈显著正相关;
短句来源
    There is very significant and positive correlation between the contents of soil readily available K in the layer A,B and vegetation coverage, and the relationship between the contents of soil readily available P in the layer B and vegetation coverage is on the contrary.
    A、B层土壤速效K含量与植被群落盖度呈正相关关系,B层土壤速效P含量与其关系相反。
短句来源
  “土壤速效p”译为未确定词的双语例句
    The CaCl_2 extractable P was very little from soils below 60mg·kg~(-1) Bray-P (termed the Change-Point), however, CaCl_2 extractable P was linearly related to the soil Bray-P. When above the Change-Point we therefore suggested that the Change-Point of around 60 mg·kg~(-1) Bray-P was a critical concentration at which leaching of P happened in vegetable soil.
    土壤Bray P低于60mg·kg-1,几乎没有检测到CaCl2浸提水溶P,而当土壤速效P大于60mg·kg-1后,CaCl2浸提水溶P随Bray P增加而直线增加.
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years field experiment on N and P balances in farmland ecosystem shows that the application of N and P fertilizers with stalk returned to soil can increase the contents of soil organic matter and total nitrogen, and its available and non-available P pools are supplemented. In last years, the utilization efficiency of P fertilizer is 22. 1 - 65. 1 %, and that ofN fertilizer is 49 - 75%. The application of storable P only has an efficiency of 6. 5 7. 3 % in the first year, and its total efficiency in-first three...

years field experiment on N and P balances in farmland ecosystem shows that the application of N and P fertilizers with stalk returned to soil can increase the contents of soil organic matter and total nitrogen, and its available and non-available P pools are supplemented. In last years, the utilization efficiency of P fertilizer is 22. 1 - 65. 1 %, and that ofN fertilizer is 49 - 75%. The application of storable P only has an efficiency of 6. 5 7. 3 % in the first year, and its total efficiency in-first three years is 24- 28. 5 %. The average utilization efficiency of applied P In nine years is 27. 9- 48. 8% , and that of supplemented P is 19. 5 - 42. 9%. The application of 65. 5kg P. ha-l. yr-1 can both satisfy the Prequirement of crops and supply the available P pool in soil.

9年的农田生态系统N、P营养平衡定位试验研究表明,N、P肥配合施用,实行秸秆还田,可提高土壤有机质和全N含量,使土壤速效和迟效P库容量得到补充.最后几年的P肥利用率达21.1—65.1%,N肥为49—75%.储备性施P第1年的利用率只有6.5-7.3%,而前3年之和达到24—28.5%,9年3个时段平均利用率27.9—42.8%,补偿性施P的19.5—42.9%.施P65.5kg·ha-1·yr-1时,既能满足作物对P的需求又能补充土壤速效P库容量.

In this investigation, 156 top layer soil samples (0~20 cm) were taken in a regular grid of 50 m by 50 m at 50 hm~2 area of vegetable plot located at the east part of Taihu road in Dapu town, Yixing city. Geo-statistics analysis of these data demonstrated that spatial variability of soil total P, Bray-P, CaCl_2 extractable P were obvious, and the high-P fields appeared at the shores of Zhudu, and Linzhuang harbors. The CaCl_2 extractable P was very little from soils below 60mg·kg~(-1) Bray-P (termed the Change-Point),...

In this investigation, 156 top layer soil samples (0~20 cm) were taken in a regular grid of 50 m by 50 m at 50 hm~2 area of vegetable plot located at the east part of Taihu road in Dapu town, Yixing city. Geo-statistics analysis of these data demonstrated that spatial variability of soil total P, Bray-P, CaCl_2 extractable P were obvious, and the high-P fields appeared at the shores of Zhudu, and Linzhuang harbors. The CaCl_2 extractable P was very little from soils below 60mg·kg~(-1) Bray-P (termed the Change-Point), however, CaCl_2 extractable P was linearly related to the soil Bray-P. When above the Change-Point we therefore suggested that the Change-Point of around 60 mg·kg~(-1) Bray-P was a critical concentration at which leaching of P happened in vegetable soil. About 28% of the investigation area were at, or above, the Change-Point of 60mg·kg~(-1) Bray-P, and had a risk of P leaching loss from soil to water. Some controlling measures of leaching loss of P to water were also recommended.

以太湖典型地区宜兴市大浦镇湖滨公路以东沿太湖50hm2老蔬菜基地为研究对象,采用网格法(50m×50m)采集表层(0~20cm)土壤样品156个.地统计学分析表明:土壤P(全P、Bray P、CaCl2浸提水溶P)呈明显空间变异,土壤高P区出现在朱渎港、林庄港两村庄附近.土壤Bray P低于60mg·kg-1,几乎没有检测到CaCl2浸提水溶P,而当土壤速效P大于60mg·kg-1后,CaCl2浸提水溶P随Bray P增加而直线增加.以土壤Bray P含量60mg·kg-1为研究地土壤发生P淋溶的临界值,研究范围内土壤发生P淋溶面积占总调查面积28%.针对目前土壤状况,提出控制蔬菜地P淋溶对策.

To supply vegetation restoration and reconstruction of removal lands in loess hilly-gully region with scientific basis, based on the data of Ansai in the typical loess hilly-gully region, the vegetation communities were analysed using hierarchical cluster analysis and step by step regression procedure to classify the stages of vegetation succession with natural restoration and quantitatively determine the relationship between the communities and soil environmental factors. The results showed that the stages...

To supply vegetation restoration and reconstruction of removal lands in loess hilly-gully region with scientific basis, based on the data of Ansai in the typical loess hilly-gully region, the vegetation communities were analysed using hierarchical cluster analysis and step by step regression procedure to classify the stages of vegetation succession with natural restoration and quantitatively determine the relationship between the communities and soil environmental factors. The results showed that the stages of succession on removal lands as follows: Artemisia secoparia community-Leymus scalinus community-Stipa bungeana community?Artemisia gmelinii community? Lespedeza daurica community-Bothriochloa ischaemum community. Rich indexes of Gleason and Margalef and Pielou index decrease with removal time passing by at first and then increase, Simpson index is relatively bigger at the early and later balance stages, and the trend of ecological dominance of the communities is opposite to that of species rich index. The contents of soil organic matter, total N, available N and readily available K increase and that of readily available P and soil PH value decrease in the process of succession. Soil surface density decreases and soil porosity increases.There is very significantly positive correlation between the contents of total N, available N, soil pH value in the layer A and the contents of total N in the layer C and species richness, and there is very significantly negative correlation between the contents of soil organic matter in the layer A,C and the contents of soil readily available K in the layer B and species richness. There is very significant and positive correlation between the contents of soil readily available P in the layer B and ecological dominance of the community. There is very significant and positive correlation between the contents of soil readily available K in the layer A,B and vegetation coverage, and the relationship between the contents of soil readily available P in the layer B and vegetation coverage is on the contrary.

为给黄土高原退耕地的植被恢复和重建提供科学依据,以黄土高原丘陵沟壑区的安塞县为例,用系统聚类和逐步多元回归的分析方法,对退耕地自然恢复植被的演替阶段进行划分,并定量分析群落演替过程中的植被特征及其与土壤环境的关系。结果表明:黄土丘陵沟壑区退耕地自然恢复草地的演替,依次经历猪毛蒿群落→赖草群落→长芒草群落、铁杆蒿群落、达乌里胡枝子群落→白羊草群落。随着退耕地植被恢复的不断进行,Gleason指数、Margalef指数等丰富度指数以及群落Pielou指数,都呈现出先减小后增大的趋势,Simpson指数在演替初期及平衡阶段较大,群落生态优势度与物种丰富度的变化趋势相反。在群落的演替过程中,土壤有机质、全N、有效N和速效K的含量不断增加,土壤pH值和速效P含量不断减小,土壤表层密度变小,孔隙度变大。A层土壤全N、有效N含量、土壤pH值和C层土壤全N含量与物种丰富度呈显著正相关,A、C层土壤有机质含量和B层土壤速效K含量与其关系相反;B层土壤速效P的含量与群落生态优势度呈显著正相关;A、B层土壤速效K含量与植被群落盖度呈正相关关系,B层土壤速效P含量与其关系相反。

 
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