1) Mixed economic threshold
复合经济阈值
2) economic threshold
经济阈值
1.
Influence of Alternanthera philoxeroides on the growth of paddy rice and its economic threshold;
空心莲子草对水稻生长的影响及其经济阈值
2.
Influence of barnyardgrass,Echinochloa crusgalli,on the growth and yield of paddy rice and its economic threshold;
稗对水稻生长和产量性状的影响及其经济阈值
3.
Perspective on understanding and using of economic threshold in pest control;
正确理解和应用经济阈值
3) economic threshold value
经济阈值
1.
In this paper, several definitions and differences-similarities of IPM were summarized;and connotations and research methods of the central question, namely ,economic threshold value and economic endanger standards were introduced in detail, it was of definite reference for integrated management of forest pest.
并对其中心问题———经济阈值和经济危害水平的内涵及研究方法 ,做了较详的介绍 ,对森林害虫的综合治理具有一定的参考价值。
2.
The economic threshold value of Fangwang forest farm in Kunming district has been determined as 0.
确定昆明地区方旺林场的经济阈值为０。
4) Multiple threshold
复合阈值
5) economic threshold for control
防治经济阈值
1.
The economic threshold for control of the major species of grasshoppers on Inner Mongolian rangeland;
内蒙古草原主要蝗虫的防治经济阈值
6) eco economic threshold
生态经济阈值
1.
By studying the effect of RSL density on rice yield and its eco economic threshold,the function equations between the RSL density and rice effective panicle,kernel numbers per panicle,1 000 grain weight and loss of yield were established.
通过水直播稻田主要恶性杂草千金子的不同密度对水稻产量及其构成的影响和千金子生态经济阈值的研究 ,建立了千金子不同密度与水稻有效穗、每穗实粒数、千粒重、产量及其损失率间的函数关系式 ,并推导出水直播稻田千金子的生态经济阈值模型。
补充资料：地理阈值
亦称地理临界值。它将地理系统中的不同状态加以分隔与区分，把某一性质的表现范围加以限制和说明。在此种意义上，地理阈值代表了系统的“状态空间”的非连续性。在一般叙述中，常把地理阈值等同于地理系统边界条件，但二者是有区别的：如果两种不同的状态同时存在于相同的边界条件之中时，地理阈值的表现可能是“非传递性”的转移；而当两种不同状态分置于不同的边界条件之中时，地理阈值的表现可能是“过渡性”地转移。无论是非传递性转移的地理阈值，还是过渡性转移的地理阈值，都使地理系统中不可能具备唯一的、通用的或稳定的解。所谓“解”都是有条件的，都是在地理阈值约束下的解。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条