毛乌素沙地榆林少区经济林配置结构研究

在毛乌素沙地榆林沙区的自然条件下，对葡萄、苹果和沙棘等经济林木结果配置，生产性能调查和分析，提出了优化的结构配置模式。结合柠条种子资源和利用价值，建议该沙区建立柠条生产基地及系列产品的开发。     

毛乌素沙地可用于园林绿化的植物资源及开发利用

采用实地调查,标本采集与查阅文献资料相结合的方法,对毛乌素沙地园林绿化植物资源进行了分析研究。结果表明,毛乌素沙地可用于园林绿化的植物有499种,隶属于83科,172属,分别阐述了它们的资源现状、观赏特性和园林用途。并且从资源调查、引种驯化和产品开发3个阶段提出了相应的对策与建议。     

区域荒漠化评价中植被的指示性及盖度分级标准研究--以毛乌素沙区为例

在分析国内外有关荒漠化评价指标体系研究现状和存在问题的基础上，提出了以植被作为主要评价因子的观点；以我国10大沙区之一的毛乌素沙区为对象，通过研究沙地、梁地、滩地和河谷地等不同地貌类型的荒漠化发生发展过程，得到主要植物指示群落的相应演替、变化规律；通过地表风沙运动与风沙流的实地观测，考查了植被对地表的保护性，并确定出风蚀荒漠化的植被盖度分级标准。     

山椒子的研究进展

山椒子属于番荔枝科紫玉盘属植物,作为一种野生果树资源,具有重要的栽培和开发利用前景。基于此,综述了山椒子的地理分布、形态特征、播种育苗研究、叶绿素测定研究、资源利用研究等方面的研究进展,并结合实地调查,对野生山椒子的开发利用提出了相应的建议。     

延安生态农业建设示范区果树资源及其合理利用

延安生态农业建设示范区有野生果树33种,半栽培果树有2种,栽培果树有15种,可引入的果树有5种。示范区果树资源以蔷薇科为主,有野生果树15种,半栽培果树有1种,栽培果树有10种。栽培果树以苹果为主。野生果树以山桃、山杏、酸枣和文冠果等为主,其利用价值较高。该示范区栽培果树树种、品种搭配不够合理,单产低,急需调整、提高。     

毛乌素榆林沙区沙产业发展战略研究

分析了毛乌素榆林沙区发展沙产业的资源优势、技术优势和区位优势,并根据该区沙产业发展现状及存在的问题,提出加速该区沙产业发展的对策。     

水土保持专家郑新民先生

对祁连山野生花卉资源的种类、分步、长生环境等进行了调查研究,结果发现祁连山野生花卉植物共34科,80属,103种。并对野生花卉资源的开发利用与保护进行了探讨     

测定沙丘前移量计算沙区风蚀模数的方法

沙区的主要土壤侵蚀是风蚀。在大范围的沙区内，风蚀主要是近地面沙粒的搬运而使沙粒在起沙风年合成方向上的前移，可用测定沙丘前移量的方法计算其风蚀模数。据此，推导了新月形沙丘和新月形沙丘链的沙丘前移量公式，并用以计算了毛乌素沙地几个沙漠块的风蚀模数。     

广西百色市野生苏铁植物资源及其保育

对广西百色市野生苏铁资源进行调查与统计，结果表明，该市有野生苏铁属植物14种，分布面积达36840hm^2，株数达384500株，全市12个县（区）均分布有野生苏铁属植物；在剖析野生苏铁资源保护中存在主要问题的基础上，提出保育的对策和建议。     

毛乌素沙地土壤风蚀的气候因子分析

在大量调查与资料收集的基础上,分析了毛乌素沙地周边部分旗县近20年的风速、降雨等气候因子及其它们之间相互叠加效应的变化特征,得出该沙区气候存在着长期持续干旱少雨,而且大风频繁发生的现象。此特征决定了该地区长期以来存在着土地沙漠化的潜在危险性。     

河道堤防滩地的水土流失及其防治

平原地区河道堤防滩地的水土流失,直接淤积河床,影响行洪安全。堤防滩地的水土流失是自然因素和人为因素共同作用的结果,以新修堤防的水土流失最为严重,对其防治须实行工程措施、植物措施和人为预防相结合。     

论水土、水土生态与水土生态保持

在论述水土在陆地生态系统中的地位和作用的基础上,提出了水土生态的概念,认为植被与水土不可分割的整体观念是水土生态的重要特征。同时,对水土生态保持的含义作了新的定义,并将水土生态保持划分为四大类型,即生态型、自然型、生产型、建设型。从水土生态的高度,从源头上、要素的联系中去认识和防治水土流失,是一种主动的、有机的、整体的水土保持观念,是水土保持认识观的深化和发展,将使水土生态保持事业进入一个崭新的时代。     

防治水土流失 建设巴渝秀美山川

重庆地处长江上游、三峡库区,由于三峡库区水土流失严重、生态环境脆弱、自然灾害频繁,且三峡库区的水土保持和生态建设事关全市经济社会发展全局、事关三峡工程建成后的安全运行和库区的长治久安,因此是我市水土保持生态建设的重点。虽然,“长治”工程的有效实施,使我市的水土保持生态建设取得了较大的成绩,但离全面建设小康社会的要求尚有不少的差距,因此,我们要紧紧抓住国家实施可持续发展战略和西部大开发战略的历史机遇,进一步增强紧迫感、责任感和使命感,调动全社会各界力量,防治水土流失,改善生态环境,建设巴渝秀美山川。     

Charge characteristics and exchangeable cation status of Korean Ultisols and Alfisols and Thai Ultisols and Oxisols

The charge characteristics of A₁ or Ap and B₂ horizon samples of total 23 Ultisols, Alfisols and Oxisols in Korea and Thailand were studied by measuring the retention of NH₄⁺ and NO₃^? at different pH values (4–8) and NH₄NO₃ concentrations (0.1–0.005 m ). The magnitude of their negative charge (σ^?; meq/100g) was dependent on pH and NH₄NO₃ concentration (C; m ) as represented by a regression equation: log σ^?=apH +blogC +c. The values of the coefficient a (0.04–0.226), b (0.03–0.264) and c (–0.676–1.262) were correlated with the kinds of the soil and horizon and with the region where the soil exists. The retention of NO₃^? was less than 1 and 2–3 meq/100 g for the A₁ or Ap and B₂ horizon samples, respectively. The sum of exchangeable base and Al (‘effective’ CEC) was close to and higher than the magnitude of permanent charge (=σ^? measured at pH = 4.3 and at C = 0.005 m ) for one-third and two-thirds of samples, respectively. A σ^? value of 16 meq/100 g clay at pH = 7 and C = 0.01 m was found appropriate to separate the B₂ horizons of Thai Ultisols and Oxisols from those of Korean Ultisols and Alfisols. Korean Alfisols and Ultisols and Thai Ultisols were distinguished from each other on the status of exchangeable base and Al     

水土保持监督管理程序与时效图文解析

水土保持法律规范和相关行政法律规范,共同构成了水土保持监督管理法律体系,其内容庞杂,相互交叉、融合,程序复杂。通过一组网络图及其简要注释,直观地表述了水土保持监督管理工作的相关程序、时效、逻辑关系和法律依据;通过对网络图呈现的逻辑问题所反映出的法律缺陷进行分析,提出应当按照立法法的有关规定,对现行法律特别是水土保持法律法规进行必要的修改,以适应不断发展的水土保持监督管理工作需要的建议。     

城镇开发区建设中的人为水土流失及防治措施

简析了婺源县城镇开发区建设过程中造成水土流失的状况、危害、原因后,提出了其防治措施,并阐明开展城市（镇）水土保持的紧迫性。     

我国滑坡、崩塌的区域特征、成因分析及其防御

论述了我国滑坡、崩塌的区域分布特征,滑坡和崩塌的危害程度,滑坡和崩塌类型和成因分析,并且提出了灾害的防御措施,以期达到环境保护成为社会发展过程中的一个重要组成部分。     

Study on Soil and Pine-Seedling Zn and Mn and Predicting-Model Design

Soils were collected from 2-year (2-y) and 3-year (3-y) old red-pine seedling plots in two tree nurseries, Hayward in the north and Wilson in the southwestern part of Wisconsin State respectively, and equilibrated with 0.01 M Ca(NO₃)₂ for soil solution Zn and Mn (solu-Zn and Mn), and with 0.01 M Ca(NO₃)2+0.005 M EDTA for soil adsorbed Zn and Mn (ad-Zn and Mn). Buffering capacity of soil Zn and Mn (b-Zn and Mn) was obtained from the ratio of ad-Zn and Mn to the solu-Zn and Mn. The concerned traces in pine seedling needles (ndls), stems(sts) and roots (rts) were simultaneously measured.     

Sodium and potassium effects on cation concentration and yield of lucerne and phalaris grown separately and together

Abstract

Lucerne (Medicago sativa L.) and phalaris (Phalaris aquatica L.) were grown separately and together in a pot trial on a yellow‐brown pumice soil with three rates of sodium (Na) and two rates of potassium (K) in factorial combination. Lucerne alone had a low Na concentration but growing phalaris as a companion grass produced herbage with a Na concentration adequate for stock. Na application increased the Na concentration in phalaris and the mixture of phalaris and lucerne much more than in lucerne alone; had little effect on K concentration; slightly reduced Mg concentration; and greatly reduced Ca concentration but not as much in lucerne as in phalaris or the mixture with lucerne. K application increased K concentration and reduced Na, Ca and Mg concentrations throughout. Yield of phalaris grown alone and in combination with lucerne was increased significantly by Na application when K concentration in the plants was low. Yield of lucerne was not affected by Na application and it is concluded that Na did not substitute for K in this species. It is concluded that field trials are warranted to investigate the possibility of growing a special purpose mixture of lucerne and phalaris on New Zealand yellow‐brown pumice soils to provide feed that has adequate Na for grazing animals.