碧绿的情丝(外二章)

一任时光匆匆流去,多少个日夜我总是泡在醋坛里。连绵的秋雨飘起了无邪的渴念,好想你,真的。凉丝丝的风儿,把我的遐思挂在枝头上。头顶,白云悠悠,小鸟啁啾;脚下,草木     

乌审旗实施国家八片重点治理的成效与做法

20年来,内蒙古乌审旗把国家八片重点治理区之一的无定河流域治理项目作为全旗最大的基础工程,科学编制规划,加强组织领导,狠抓措施落实,完善规章制度,充分发挥科技人员的作用,完善资金使用管理办法,建成了一批高标准、高质量的精品工程,改善了生态环境,促进了区域经济的发展。一、二期重点治理实施的28条小流域,治理程度达到85.5％,植被覆盖率达到70％,年土壤侵蚀模数从6400t/km~2减少到3000t/km~2,农牧民年人均纯收入达到3387元。     

加快西宁河流域水土流失综合治理的思考

笔者针对西宁河流域水土流失的现状，提出了从加快生态修复和提高综合防治效益两方面来恢复西宁地区的植被，遏制正在加剧的水土流失，使西宁河流域生态环境恢复昔日的原貌。     

存在还是灭亡？

今年，北京市将在盛夏的酷暑中迎接水价大幅上调的水费改革，水价的调整触及到各行各业及每个家庭的经济利益，因此，一时间，有关节约用水及水资源保护的问题成为焦点话题，受到人们的热切关注。不过，通过价格杠杆来提醒人们的节水意识，并产生一些实际效果，这些终究还是     

伊犁河流域湿地保护与合理利用

伊犁河流域湿地分布广泛，是我区重要的国土资源和自然资源，它与伊犁河流域人民的生存、繁衍、发展息息相关，它具有抵御洪水，调节径流，蓄洪防涝，保护水体，净化水质，降解环境污染，调节气候，美化环境等多种功能，既可以减少洪水灾害，又可以直接为工农业生产提供水源，同时还可以起到防止风蚀、土壤局部沙化、盐渍化、水土流失及旱灾等其他系统不可替代的作用。     

河流与村庄

一个拥有河流的村庄是幸福的。很多年前，每逢假期。我都无一例外地寻找一切机会去外婆家——一个拥有河流的村庄。那个名叫泉口坝的村庄除了拥有一条河，还拥有一口温泉。我去那里，很大程度上是出于对那条河和那眼温泉的依恋。这就是说，我对世界的认识是从河流和村庄开始的。     

喀麦隆采伐公司承诺实施森林可持续经营

世界野生生物基金会（WWF）中非地区办事处发布的消息称，喀麦隆3家主要采伐公司已加入WWF建立的中非森林和贸易网络（CAFTN），以便为刚果河流域的森林采伐制定新的标准。根据最近达成的一项协议，实施可持续经营的天然林将达到70万hm^2。     

研究发现野鸭城市生活艰难

科学家最近研究发现，野鸭在城市中生活充满艰辛，其中一些野鸭甚至无法活下来。俄罗斯国立莫斯科大学的生物地理学专家科尔布特对莫斯科绿头鸭的研究表明，城市河流两侧的水泥岸造成河边没有了自然形成的浅滩和植物，城市中很难找到较泥泞的河滩与小岛，     

Concentration variations of several ions in stream after a wildfire

In May 2006, a high intensity wildfire occurred in Songling forest region in Daxing＇an Mountains, China. The concentration changes of eight ions （K^＋, Na^＋, Ca^2＋, Mg^2＋, Cl^-, Br^-, NO3^- and SO4^2-） were measured in burned and tmbumed streams after fire from May to Oct., 2006. Results show that the most ions flux were higher in burned stream than that in unburned stream during the sampling period, and the greatest concentrations of most ions transported from burned stream occurred in July. After fire, the most amplitude chemical ion was Ca^2＋, whose average concentration was 5.50 mg·L^-1 higher than that in unburned stream, and the total concentration of every chemical ion presents a trend Ca^2＋〉SO4^2- 〉Na^＋〉Mg^2＋〉NO3^- . The average concentrations of Ca^2＋, SO4^2- , Na^＋＇Mg^2＋,NO3^- showed an increase trend, but those of K^＋, Cl^- , Br had a decreased trend. SO4^2- had the largest loss among these anions, followed by NO3^-. Overall, the increase degree of cation was greater than that of anion after burning.     

神农架地区珍衡植物沿河岸带的分布格局

Due to the importance of riparian zone in maintaining and protecting regional biodiversity, increasingly more ecologists paid their attentions to riparian zone and had been aware of the important effects of riparian zone in basic study and practical management. In this study, 42 sampling belts (10 m×100m) parallel to the bank of Xiangxi River at different elevations in Shennongjia Area were selected to investigate the riparian vegetation and rare plants. 14 species of rare plants were found distributing in riparian zone, accounting for 42.4% of the total rare plant species in Shennongjia Area. The main distribution range of the 14 rare plant species was the evergreen and deciduous mixed broadleaved forest at elevation of 1200–1800 m, where, species diversity of plant community was the maximum at the moderate elevation. The analysis of TWINSPAN divided the 14 rare species into 3 groups against the elevation, namely low elevation species group, moderate elevation species group, and high elevation species group. The analysis of DCA ordination showed similar results to that of TWINSPAN. In the paper, the authors discussed the reasons forming the distribution pattern of rare plant species, and pointed out that the important function of riparian zone on rare plant species protection. Foundation item: This project was supported by National Natural Science Foundation of China (NSFC39970123), and Changbai Mountain Open Research Station, Chinese Acadamy of Science. Biography: JIANG Ming-xi (1965-), male, associate professor in Wuhan Institute of Botany, Chinese Academy of Sciences, Wuhan 430074, P. R. China Responsible editor: Chai Ruihai