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   再循环指数 在 农业基础科学 分类中 的翻译结果: 查询用时:0.971秒
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再循环指数    
相关语句
  recycling index
    2. At present, the recycling index of N, P, K is, respectivlely, 27.92%, 48.79% and 46.62%.
    2.目前,系统中氮、磷、钾的再循环指数分别为27.92%、48.79%和46.62%,系统稳定后,氮减至27.65%。
短句来源
  recycling indices
    The sensitivity Analysis of Recycling Indices of Nitrogen,Phosphorus and Potassium in an Agroforestry Ecosystem of the Populus euramericana-Triticum sativum-Zea mays
    农林业复合生态系统沙兰杨-小麦-玉米群落类型氮、磷、钾再循环指数灵敏度分析
短句来源
    The sensitivities of recycling indices of nitrogen, phosphorus and potassi-um(N,P,K)in the agroforestry ecosystem of Populus euramericana-Triticum sativum-Zea mays were analyzed.
    本文对黄淮海平原豫北地区农林业生态系统沙兰杨-小麦-玉米群落类型营养元素氮、磷、钾在系统内的分布、累积、循环进行了系统的研究,并对三种营养元素的再循环指数及其灵敏度进行了分析。
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  recycling index
Specific Knowledge on Recycling Index and Participants' Responses 25 Table 14.
      


~(15)N labelled technique was used for understanding the transferring and cycling of nitrogen in micro-agroecosystems with soil-ryegrass-rabbits-rice compartments and soil rice compartments. Preliminary results showed that the utilizational rate of (NH_4)_2SO_4 by ryegrass was 59.36% for the above ground portion and 9.79% for roots. As ~(15)N labelled ryegrass was comsumed by rabbit,the ~(15)N labelled recovery rates in feces and urine collected were 11.78% and 17.95% respectively. Rabbit excrement-nitrogen...

~(15)N labelled technique was used for understanding the transferring and cycling of nitrogen in micro-agroecosystems with soil-ryegrass-rabbits-rice compartments and soil rice compartments. Preliminary results showed that the utilizational rate of (NH_4)_2SO_4 by ryegrass was 59.36% for the above ground portion and 9.79% for roots. As ~(15)N labelled ryegrass was comsumed by rabbit,the ~(15)N labelled recovery rates in feces and urine collected were 11.78% and 17.95% respectively. Rabbit excrement-nitrogen was integrated with inorganic fertilizer nitrogen in different proportions as 1:0, 0.5:0.5, 0.3:0.7 and 0:1 for rice culture. Results showed that the uptake of nitrogen by rice plant was 67—70% from the soil and 30—33% from fertilizers.The utilizational rates by rice plant were increased with the proportion of inorganic nitrogen. They were 36.94%, 40.52%, 40.73% and 43.91% for treatment 1—4. The yield of rice grain decreased with the proportion of inorganic nitrogen, however. The functional effects of organic fertilizer on the ecosystems were:(l) promoting the ear and root development of rice plant;(2) increasing the transferring ability of nitrogen from straw to rice grain, especially in 0.5:0.5; (3)maintaining inorganic fertilizer nitrogen in soil; (4)decreasing losses of nitrogen to air and waters. In treatment 0.3:0.7, the utilizational rate of organic fertilizer nitrogen was enhanced, and no considerable increment of utilizational rate of inorganic fertilizer nitrogen was found in the study. According to the complexity of food chain and the nitrogen recycling indexes in different microecosystems, it is considered that the maturity and stability of the ecosystem were higher in treatments 1:0,0.5:0.5, and 0.3:0.7, but lower in the treatment 0:1 which consists of rice plantation and relaying on inorganic fertilizers only.

本文应用~(15)N示踪法研究了有机态和无机态肥料氮在微型农业生态系统中循环的机理,以及配施下各自的功能和相互影响。初步结果表明,在土壤-黑麦草-兔亚系统中,草对硫铵~(15)N利用率达59.36%;以草饲兔,所收集兔粪~(15)N回收率为11.78%,尿为17.98%。兔粪尿N与硫铵N以1:0,0.5:0.5,0.3:0.7和0.1配施种稻,结果表明,在土壤-水稻亚系统中:(1)0.5:0.5配施促进穗头和根系发育;(2)稻株吸收有机态和无机态肥料N的比例,受配施比例的影响;(3)与单施无机肥料氮比较,配施下无机肥料氮利用率未提高或甚至下降;(4)0.3:0.7配比使有机态肥料N利用率提高;(5)0.5:0.5配比,有机肥能明显地促进无机态肥料N从秆向谷运输;(6)有机肥使无机态肥N在土壤中的固化作用增加,从而使无机肥料氮向环境转移量下降。农业生态系统具有多组分和牧食-碎屑复合食物链,氮素再循环指数达0.5,生态稳定性和发育程度优于单一种植系统。

In this paper, the authors analysed the macroscopic characteristics of circulation of N, P, K of the agroecosystem in Taihu Lake area, Jiangsu province by using the compartment model theory. 1. The agroecosystem is stable and N, P, K will reach the stable point in the years of 2020, 2007 and 2566 respectively. 2. At present, the recycling index of N, P, K is, respectivlely, 27.92%, 48.79% and 46.62%. In their stable points that will be 27.65%, 49.33% and 47.55%. 3. In the present situation, the storage and...

In this paper, the authors analysed the macroscopic characteristics of circulation of N, P, K of the agroecosystem in Taihu Lake area, Jiangsu province by using the compartment model theory. 1. The agroecosystem is stable and N, P, K will reach the stable point in the years of 2020, 2007 and 2566 respectively. 2. At present, the recycling index of N, P, K is, respectivlely, 27.92%, 48.79% and 46.62%. In their stable points that will be 27.65%, 49.33% and 47.55%. 3. In the present situation, the storage and output of N, P are increasing and those of K are decreasing year by year. 4. The effect of input of N on the system funciton is the most important and that of P is the next. 5. Husbandary subsystem is the most sensitive part to the input of the system.

作者应用分室模型理论,对江苏太湖地区农业生态系统中氮、磷、钾转化的特征进行了宏观分析,结果表明: 1.该系统是稳定的,而且是渐近稳定。氮、磷、钾将分别在2020、2007和2566年达到稳定点,前二者渐增,后者逐减。 2.目前,系统中氮、磷、钾的再循环指数分别为27.92%、48.79%和46.62%,系统稳定后,氮减至27.65%。磷、钾分别增至49.33%和47.55%。 3.当前状况下,氮、磷的输出和库存逐年增加,钾逐年减少。 4.氮素的输入效应最大,磷次之。 5.畜牧亚系统对外界的输入变化反应最快,依赖性最强。

The sensitivities of recycling indices of nitrogen, phosphorus and potassi-um(N,P,K)in the agroforestry ecosystem of Populus euramericana-Triticum sativum-Zea mays were analyzed. The results showed that when the sensitivities of output recy-cling indices were negative, a decrease of cycling indices in soil was detected. The nutri-ent elements returned by plants were the most important factor in increasing the recy-cling indices. In the whole agroforestry ecosystem, all sensitivities of phosphorus recy-cling...

The sensitivities of recycling indices of nitrogen, phosphorus and potassi-um(N,P,K)in the agroforestry ecosystem of Populus euramericana-Triticum sativum-Zea mays were analyzed. The results showed that when the sensitivities of output recy-cling indices were negative, a decrease of cycling indices in soil was detected. The nutri-ent elements returned by plants were the most important factor in increasing the recy-cling indices. In the whole agroforestry ecosystem, all sensitivities of phosphorus recy-cling indices were larger than those of N and K.

本文对黄淮海平原豫北地区农林业生态系统沙兰杨-小麦-玉米群落类型营养元素氮、磷、钾在系统内的分布、累积、循环进行了系统的研究,并对三种营养元素的再循环指数及其灵敏度进行了分析。结果表明:在植物组分库中,氮、磷、钾的年累积量分别为317.436,70.917和238.758kg/hm2,年吸收量分别为310.444,68.329和229.801kg/hm2;在枯落物库中,三种元素的年凋落量分别为24.35,3.79和33.96kg/hm2·a;在0─80cm的土壤库中,三种元素的全量分别为:285.56,347.38和489.48g/m2,有效量分别为36.81,26.54和62.87g/m2;三种元素的归还率分别为5.02%,3.1%和10.5%,吸收系数分别为0.11,0.02和0.0047,利用系数分别为0.98,0.76和0.98,循环系数分别为0.078,0.055和0.15。输出趋于减少的营养元素的再循环指数,植物凋落层对于增加再循环指数是最关键的。营养元素磷再循环指数的灵敏度比氮和钾大,即磷的循环过程是最不稳定的。

 
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