扎实做好“十一五”水土保持工作 努力为社会主义新农村建设服务

“十五”期间我国水土保持重点治理大幅度拓展,水土流失综合防治步伐加快,共完成水土流失综合防治面积54万km2;监督执法工作进一步加强,共审批各类水土保持方案20多万个,开发建设项目防治面积7万多km2;生态修复取得突破,全国实施封禁范围达到60多万km2;监测评价体系建设初见成效,水土流失预测预报能力增强;基础工作不断强化,科技支撑与技术标准体系初步形成;宣教活动继续深入开展,全社会水土保持意识普遍增强。“十一五”期间水土保持工作总的目标是:全国水土流失面积占国土面积的比例在现有的基础上再稳定减少2%,基本建成比较完善的全国水土保持预防监督体系和水土流失监测网络,水土保持法律法规进一步完善,人为水土流失得到有效遏制。提出了主要保障措施,明确了2006年的主要工作。     

继往开来 建设陕西秀美山川

“九五”期间陕西省年均治理面积由过去的 2 0 0 0km2 左右增加到 2 5 0 0km2 。截至 2 0 0 0年底 ,全省累计治理水土流失面积 5 89万km2 ,治理程度达 5 8%。介绍了“九五”期间陕西省水土保持生态环境建设的基本做法 ,提出了“十五”期间水土保持工作的基本设想     

突出重点 加强科技 推动水土保持事业又好又快发展

2006年各项水土保持工作取得了新进展:历时近2年的“中国水土流失与生态安全综合科学考察”取得重大研究成果,全国共审批开发建设项目水土保持方案2.31万个,全年完成水土流失综合治理面积4.17万km2,完成生态初步修复面积35万km2,全国水土保持监测评价体系逐步完善。在今后的工作中必须坚持用科学发展的理念指导水土保持实践、切实把水土保持工作纳入新农村建设之中,依法加强对开发建设项目的全过程管理,注重通过产业发展来带动水土流失防治工作。2007年的重点工作是:强化监督执法,继续推动和实施好各级重点工程建设,注重提高生态自我修复工作的水平,积极推进水土保持机制体制创新,加大水土保持宣传力度。总结了“十五”以来的水土保持科技工作,明确了今后水土保持科技工作的思路、主要目标和任务,提出了加强水土保持科技发展的政策措施。     

抓住发展机遇 加快治理步伐 为构建和谐社会做贡献

“十五”期间,“长治”工程累计完成水土流失治理面积2.1万km2,实施生态修复面积2060km2,开展预防保护面积11万km2;水土流失监测面积达70万km2,预报处理滑坡、泥石流灾害86处,累计审批水土保持方案8.1万起;经过17年的连续治理,长江流域水土流失面积减少了15%,治理区人均基本农田达到约1亩、人均产粮增至530kg、农民人均纯收入翻了一番。“长治”工程建设的主要经验是领导重视、齐抓共管,与时俱进、开拓创新,强化管理、完善制度。“十一五”时期“长治”工程建设必须坚持人与自然和谐相处,以人为本,政府推动,统筹协调,预防为主,保护优先的原则,完成水土流失综合治理面积1.23万km2,改建或新建20个重点监测预警站点,全面落实水土保持方案,执行率达到90%以上,完成监测面积160万km2,强化水土保持规划、科研、示范等基础工作。明确了近期要抓好的几项工作。     

明确任务 加快水土保持生态建设步伐

1998年以来内蒙古自治区生态建设以每年造林 3 3 3 3万hm2 、治理水土流失面积 43 3 3万hm2 的速度推进。至 2 0 0 0年底全区黄河流域 (片 )累计治理水土流失面积 2 5 6万km2 。“十五”期间 ,全区将治理沙漠化土地 666 67万hm2 ,治理水土流失面积 166 67万hm2 。提出了“十五”期间水土保持生态环境建设的主要措施     

坚持科学发展观 落实两个可持续努力 推进“十一五”时期“长治”工程建设

“十五”期间,长江上中游水土保持重点防治工程治理水土流失面积2.1万km2,完成生态修复面积2 060km2;监测覆盖面积累计近70万km2,共预报处理滑坡、泥石流灾害86处,各级水保部门累计对1.9万起开发建设项目造成的人为水土流失违法案件进行了立案查处。“十五”“长治”工程的重要经验是加强领导,强化管理,转变观念,调整思路,深化改革,创新机制,抓点带面。“长治”工程“十一五”工作的重点是:结合社会主义新农村建设推进“长治”工程建设,继续做好世行贷款水土保持生态建设项目,进一步贯彻落实水土保持法,创新推动重点防治工程再上新台阶,进一步抓好基础工作。部署了2006年的重点工作。     

防治水土流失 再造秀美山川

5年来 ,全国水土保持生态建设 ,通过加强组织领导 ,积极调整思路 ,狠抓落实 ,探索出了一条加快水土流失治理的新路子。近期目标是 :“十五”期间完成综合治理水土流失面积 2 5万km2 ,实施重点保护面积 5 0万km2 。当前的重点工作是 :加强封育保护 ;大力推进重点工程建设 ;抓好大示范区建设 ;加强机制创新和体制创新 ;加大监督执法力度 ;加强水土保持科研和新技术推广应用工作     

吉林省水土保持生态环境建设形势与目标

吉林省现有水土流失面积 2 935万km2 ,虽比 1985年减少 1 0 5 3万km2 ,但各类型侵蚀程度却明显加重 ,土壤风化、沙化和盐碱化日趋严重 ,水土流失发展令人担忧。水土保持是生态环境建设的主体 ,“十五”期间全省将完成水土流失治理面积 5 6 70km2 ,2 0 0 6～ 2 0 15年完成治理水土流失面积 1 134万km2 ,2 0 16～ 2 0 30年使全省 80 %以上的水土流失面积得到整治 ,遏制人为水土流失 ,实现山川秀美     

提高认识抓住重点继续搞好以淤地坝为主的水土保持工作

“十五”期间,全省共治理水土流失面积2万km2,其中,建设淤地坝3 700多座,在建设大流域样板、发展民营水土保持、推行生态自然修复和加强工程建设管理等方面积累了丰富经验。“十一五”期间,要在水土流失最严重的43个县区大力开展以淤地坝建设为中心的水土保持,年初步治理水土流失面积36万hm2以上,年治理程度达到3%以上。为了确保目标任务的顺利实现,一要加强领导,二要强化监督执法,三要认真制定落实政策。     

抓住机遇 开拓创新 全面推进水土保持生态建设

“九五”期间 ,全国完成水土流失综合治理面积 2 3万km2 ,八片治理工程、“长治”工程已成为典型的生态建设示范工程 ,有力地推动了面上的治理工作 ,调动了全社会参与水土保持生态建设的积极性。“十五”期间 ,要把保护和改善生态环境放在首位 ,突出生态效益 ,进行防治战略调整 ,充分发挥生态的自然修复能力 ;全国完成综合治理面积 2 5万km2 ,基本遏制生态环境恶化趋势 ,加强水保执法监督队伍建设 ,提高水保科技含量     

“摩尔”教学的几点体会

介绍了一种如何在初中化学知识的基础上导入摩尔概念的新颖教学法,展示了这种方法的良好效果。     

Sorption-desorption of "aged" sulfonylaminocarbonyltriazolinone herbicides in soil

Sorption-desorption interactions of pesticides with soil determine the availability of pesticides in soil for transport, plant uptake, and microbial degradation. These interactions are affected by the physical and chemical properties of the pesticide and soil, and for some pesticides, their residence time in the soil. The objective of this study was to characterize sorption-desorption of two sulfonylaminocarbonyltriazolinone herbicides incubated in soils at different soil moisture potentials. The chemicals were incubated in clay loam and loamy sand soils for up to 12 wks at -33 kPa and at water contents equivalent to 50 and 75% of that at -33 kPa. Chemicals were extracted sequentially with 0.01 N CaCl(2) and aqueous acetonitrile, and sorption coefficients were calculated. Sufficient sulfonylaminocarbonyltriazolinone herbicides remained (>40% of that applied) during incubation to allow calculation of sorption coefficients. Aging significantly increased sorption as indicated by increased sorption coefficients. For instance, for sulfonylaminocarbonyltriazolinone remaining after a 12-wk incubation at -33 kPa, K(d) increased by a factor of 4.5 in the clay loam soils and by 6.6 in the loamy sand as compared to freshly treated soils. There was no effect of moisture potential on sorption K(d) values. These data show the importance of characterization of sorption-desorption in aged herbicide residues in soil, particularly in the case of prediction of herbicide transport in soil. In this case, potential transport of sulfonylaminocarbonyltriazolinone herbicides would be over-predicted if freshly treated soil K(d) values were used to predict transport.     

生态冷漠症的“诊”与“治”

当今有一部分政府官员患有生态冷漠症,其表现有3种,即面对持续恶化的生态环境麻木不仁,生态建设取得一点成绩便盲目乐观,发生了生态安全问题就怨天尤人。医治生态冷漠症应重点抓好以下3个方面的工作:紧密结合工作实际,切实加强对广大干部的科学发展观教育;完善和推行绿色GDP核算标准,加强对各级政府及其官员的考核;制定和完善有关法律法规,加大对政府行为的约束力度。     

Antioxidant compounds and antioxidant activity in "early potatoes"

The antioxidant content and the antioxidant capacity of both hydrophilic and lipophilic antioxidant extracts from four "early potato" cultivars, grown in two different locations (Racale and Monteroni), were examined. There was a considerable variation in carotenoid content and weak differences in the ascorbic acid concentration of the examined cultivars of "early potato" and between the harvested locations. An increase in both methanol/water (8:2 v/v) and phosphate buffer soluble (PBS) free phenols (70%) and bound phenols (28%) in the extracts from the cultivars grown at Racale site was found and discussed. Examination of individual phenols revealed that chlorogenic acid and catechin were the major phenols present in potato tuber extracts; a moderate amount of caffeic acid and ferulic acid was also detected. The total equivalent antioxidant capacity (TEAC) was higher in the Racale extracts and a highly positive linear relationship ( R (2) = 0.8193) between TEAC values and total phenolic content was observed. The oxyradical scavenging capacity (TOSC) of methanol/water and PBS extracts of peel and whole potatoes against the reactive oxygen species (ROS) peroxyl radicals, peroxynitrite, and hydroxyl radicals was also analyzed. A highly significant linear correlation ( R (2) = 0.9613) between total antioxidant capacity (as a sum of peroxyl radicals + peroxynitrite) and total phenol content of methanol/water extracts was established. Moreover, proliferation of human mammalian cancer (MCF-7) cells was significantly inhibited in a dose-dependent manner after exposure to potato extracts. These data can be useful for "early potato" tuber characterization and suggest that the "early potato" has a potential as a dietary source of antioxidants.     

韭园沟示范区“三项制度”实践的效果

韭园沟示范区项目实施运行实践证明,水土保持生态工程建设实行项目法人制是完全可行的,实行工程招标投标制的作用和效果非常明显,实行工程监理制作用也比较明显。但在目前的社会经济条件下,实行项目法人制和工程监理制在操作上还不够完善,而实行工程招标投标制还存在着制约因素。     

Polyphenols as chemotaxonomic markers in Italian "long-storage" tomato genotypes

"Long-storage" tomato ( Solanum lycopersicum L.) is a niche product typical of the Mediterranean area, traditionally cultivated under no water supply, the fruits of which combine a good taste with excellent nutritional properties. High-performance liquid chromatography coupled with diode array detection and electron spray-mass spectrometry (HPLC/DAD/ESI-MS) was used to identify the phenolic profile in 10 landraces of long-storage tomato, grown under a typical semiarid climate, as compared to a processing tomato hybrid cultivated in the same environment, under both well-irrigated and unirrigated conditions. Sixteen different secondary metabolites, belonging to the classes of cinnamoylquinic acids and flavonoids, were identified. Quantitative analyses were also performed to monitor the changes in the phenolic content along the batch. The results highlighted that landraces originating from the same area exhibit different fruit morphologies but own a similar biochemical profile. Moreover, the two controls (well irrigated and unirrigated) are placed into the same cluster, suggesting that these secondary metabolites in tomato fruits may be more genetics-dependent than environment-dependent. Given the analysis of phenols nowadays represents a useful tool to assess the genetic variability in tomato, these compounds could be adopted as chemotaxonomic markers in the traceability of this niche product.     

Sorption-desorption of two "aged" sulfonylaminocarbonyltriazolinone herbicide metabolites in soil

Aging (herbicide-soil contact time) has been shown to significantly affect the sorption-desorption characteristics of many herbicides, which in turn can affect the availability of the herbicide for transport, plant uptake, and microbial degradation. In contrast, very little work in this area has been done on herbicide metabolites in soil. The objective of this study was to characterize the sorption-desorption of sulfonylaminocarbonyltriazolinone herbicide metabolites incubated in soils at different soil moisture potentials. A benzenesulfonamide metabolite and a triazolinone metabolite from sulfonylaminocarbonyltriazolinone herbicides were incubated in clay loam and loamy sand soils for up to 12 weeks at -33 kPa and at water contents equivalent to 50 and 75% of that at -33 kPa. Chemicals were extracted sequentially with 0.01 N CaCl(2) and aqueous acetonitrile (solution and sorbed phase concentrations, respectively), and apparent sorption coefficients (K(d,app)) were calculated. Sufficient metabolite remained during the incubation (>55% of applied) to allow determination of the coefficients. The initial aging period (2 weeks after application) significantly increased sorption as indicated by increased K(d,app) values for the chemical remaining, after which they remained relatively constant. After 12 weeks of incubation at -33 kPa, K(d,app) values for benzenesulfonamide and triazolinone increased by a factor of 3.5 in the clay loam soil and by a factor of 5.9 in the loamy sand as compared to freshly treated soils. There was no effect of moisture potential on aged apparent K(d,app) values. These data show the importance of characterization of sorption-desorption in aged herbicide residues, including metabolites, in soil, particularly in the case of prediction of herbicide residue transport in soil. In this case, potential transport of sulfonylaminocarbonyltriazolinone herbicide metabolites would be overpredicted if freshly treated soil K(d) values were used to predict transport.     

Production and composition of cider spirits distilled in "alquitara"

The capacity of alquitara (a traditional distillation system) to produce cider brandies is evaluated. To do so, the chemical composition of 12 fractions obtained during the distillation process and the cider brandies obtained from five ciders were analyzed (alcohol strength, methanol, volatile substances, furfural, and metals), taking into account European and Spanish legislation. During the course of distillation, an important increase in methanol, furfural, 2-phenylethanol, and metals in the last fractions was observed, while fusel oils were more abundant in the first fractions collected. Only acetaldehyde behaved differently, showing a minimum concentration in the middle fractions that might be explained by its formation on the surface of alquitara. On the other hand, the final distillates obtained by means of this method complied with the considered regulations. Worth highlighting in this regard are the low levels of a potential toxin such as methanol, as well as the detection of a constant ratio for methanol, ethanol, and fusel oil for the pairs of cider/spirits analyzed, which could be interpreted as an indication of good uniformity in the distillation system and method, thus guaranteeing product quality.     

"数字黄土高原"到"数字水土保持"

立足于黄土高原水土保持与生态环境建设及其科学研究的要求和空间信息科学技术发展的最新动态，通过：数字黄土高原”建立的时代背景及其技术背景，讨论了“数字黄土高原”研究与建设的目标，基本内容，关键技术环节（包括数据库结构，数据集成方法，数据更新，元数据体系建设和数字共享机制）和推广应用等，初步讨论了“数字水土保持”及其与国家空间数据基础设施（NSDI）建设的关系。     

“3S”技术在农业非点源污染研究中的应用

应用“3S”技术进行农业非点源污染预测、控制和管理是最新的动向。为此结合国内外“3S”技术在农业非点源污染研究中的应用现状 ,阐述了“3S”技术在非点源污染研究中的应用意义和方法 ,并对“3S”技术在此领域发展动态进行了展望