Based on field review and data collection , we study the land production potentiality and land carrying capacity in the zone . the main conclusions are as follows . 1 the research estimates the cropland production potentiality by step correct method 本项目在野外考察和资料收集的基础上，对陕北农牧交错带土地生产潜力及人口承载量进行了系统的分析研究，得到以下主要结论和成果： 1采用逐步订正法估算作物生产潜力。
The soil attribute data are built based on the second soil general investigation and samples got outside and analyzed inside . the assessment system of nanjing soil quality is built by taking advantage of principal component analysis and multiple linear regression equation 在第二次土壤普查资料和野外采样分析基础上建立土壤属性数据库，用主成分分析法和多元回归法对南京不同类型土壤进行生产潜力评价，建立南京土壤质量评价体系。
The changes in month rainfall are not consistent with that of the annual rainfall . this recognition could is the premise for the study of various technological measures to regulate the annual rainfall , and has great significan ce for the full utilization of the limited rainfall in ningnan areas 认识宁南旱区降水量的时空变化规律和降水特征，对研究并推广运用技术措施，积极安排抗旱，做到年际调控用水，增进该地区有限降水的生产潜力具有重要意义。
According to ecosystem transform laws of energy and substance circulation in space and time , the principle of water and soil fertility limit function , adopting the crop growth dynamic model , this paper evaluates proactive potentialities of cereal crops and main industrial crops cotton in the area 根据生态系统中物质、能量在时间、空间的循环转化规律与水分、土壤限制作用原理，采用作物生长动态模型，估算了该区粮食作物与主要经济作物棉花的生产潜力。
The order of the climate production potentiality is : fugu > jiaxian > jingbian > yuyang > shenmu > hengshan > dingbian , and the order soil production potentiality is : dingbian > shenmu > fugu > hengshan > yuyang > jiaxian > jingbian . at the same time , this paper describes the guiding suggestions to improve the cropland production potentiality 提高土地生产潜力一方面要调控降水，加强基本农田建设，兴修水利，应用集流节水技术，发展灌溉农业；另一方面要改良土壤，培肥地力。
Abstract : on the basis of the atmosphere - crop - soil systems , the synthetical production potentiality model of the grain crops is established in guizhou , the concept of crop increase production potentiality index is posed , the prospects of the synthetical increase production potentialities of crop uder the present and future circumstances are analysed 文摘:从大气作物土壤系统出发，建立了贵州省主要粮食作物综合生产潜力模式，提出了作物增产潜力指数的概念，分析了在现实条件下和未来条件下作物综合增产潜力的前景。
A large number of scientists have made a lot of carefully and thoroughly studying works and obtained many important results for widening absorbing ability of soil water , regulating suitability of roots to water stress , exploiting productive potential of dryland in the last several decades 摘要几十年来，大量科学工作者为拓宽小麦根系对土壤水分的吸收能力和调控根系对干旱的适应能力，挖掘干旱地区的生产潜力，实现高产做了大量细致的研究工作，取得了许多重要研究成果。
The result shows it can raise seedling apparently , ability of fighting drought and growth , to dip in the afforestation of thick liquid with rpa ; dress and soak seed handling , can strengthen seed vigour , raise emergence rate and sprout rate , make sprout even sprout strong , raise the production potential of soil 摘要用rpa进行常规蘸浆造林，能显著地提高苗木的抗旱能力和生长量；进行拌种和浸种处理，可以增强种子活力，提高出苗率和成苗率，使苗齐苗壮，提高土壤的生产潜力。
The analysis illustrates that : the total return of water resources for zhangye oasis agriculture is increasing by degrees as times goes by , and it would be fluctuated accordingly by the natural disaster ; the average returns are comparetively high at the period of late 1990s and early 1980s ; the marginal returns are decreasing by degrees as the water consumption increase ; and the water resources marginal returns in linze and zhangye are nearly of zero . as for the space distribution , the average returns and marginal returns of agriculture consumption in the mountain spring area are higher than those in the well area , which shows that the mountain area has bigger production potential 就空间分布而言，对张掖地区各子绿洲和甘州区内不同灌区的代表乡镇的分析具有相同的结论:山水灌区农业用水的边际效益高于盆地中心的井水、泉水灌区;山区农业生产受水资源的制约更加明显，同时也具有比平川绿洲更大的生产潜力;山丹、民乐等山水灌区的绿洲需要增加灌溉水量以促进农业生产的发展，而绿洲核心的井泉灌区在现有技术条件下，不需要再扩大用水规模。
16032 evaluation units of the potential land productivity were overlaid out . by using the mechamism methodology and relative computing models , yaan city ' s land productive potentiality was computed according to synthetic index of land productivity evaluation that was taken as soil effective coefficient . result of research indicated that : ( a ) siol effective coefficient changed from 0 . 3047 to 0 . 8550 , respectively with medium - low yield farmland of 71 . 28 percent . ( b ) the division of climate productivibilty is situated on the third degree and fourth class western area in east of chian 4 、雅安市土地自然生产潜力与目前的实际生产水平比较，其增产潜力平均为23 . 53 ，说明农业技术和管理措施等的增产潜力较大；将目前土地的实际生产水平与15年前比较，土地的实际生产水平逐年上升，年均递增0 . 64 ，显然，土地的自然生产潜力是可以通过各种农技措施来挖掘的。
