The effect of land management on carbon and nitrogen status in plants and soils of alpine meadows on the Tibetan plateau     

W. Y. Wang  Q. J. Wang  Ch. Y. Wang  H. L. Shi  Y. Li  G. Wang 《Land Degradation \u0026amp; Development》2005,16(5):405-415

Large‐scale grassland rehabilitation has been carried out on the severely degraded lands of the Tibetan plateau. The grasslands created provide a useful model for evaluating the recovery of ecosystem properties. The purposes of this research were: (1) to examine the relative influence of various rehabilitation practices on carbon and nitrogen in plants and soils in early secondary succession; and (2) to evaluate the degree to which severely degraded grassland altered plant and soil properties relative to the non‐disturbed native community. The results showed: (1) The aboveground tissue C and N content in the control were 105·97 g m⁻² and 3·356 g m⁻², respectively. The aboveground tissue C content in the mixed seed treatment, the single seed treatment, the natural recovery treatment and the severely degraded treatment was 137 per cent, 98 per cent, 49 per cent and 38 per cent, respectively, of that in the control. The corresponding aboveground tissue N content was 109 per cent, 84 per cent, 60 per cent and 47 per cent, respectively, of that in the control. (2) Root C and N content in 0–20 cm depths of the control had an average 1606 g m⁻² and 30·36 g m⁻², respectively. Root C and N content in the rehabilitation treatments were in the range of 26–36 per cent and 35–53 per cent, while those in the severely degraded treatment were only 17 per cent and 26 per cent of that in the control. (3) In the control the average soil C and N content at 0–20 cm was 11 307 g m⁻² and 846 g m⁻², respectively. Soil C content in the uppermost 20 cm in the seeded treatments, the natural recovery treatment and the severely degraded treatment was 67 per cent, 73 per cent and 57 per cent, respectively, while soil N content in the uppermost 20 cm was 72 per cent, 82 per cent and 79 per cent, respectively, of that in the control. The severely degraded land was a major C source. Restoring the severely degraded lands to perennial vegetation was an alternative approach to sequestering C in former degraded systems. N was a limiting factor in seeding grassland. It is necessary for sustainable utilization of seeding grassland to supply extra N fertilizer to the soil or to add legume species into the seed mix. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

关于青海省东部农业区退耕还林工程后续产业发展的思考     

吴江红 《河北农业科学》2008,12(6):114-115

退耕还林工程实施8年以来,东部农业区的生态环境得到了一定的改善,也使退耕农民得到了实惠,然而特殊的自然地理环境限制和阻碍了退耕还林工程后续产业的发展。根据群众在实践中的有益探索,提出了加快发展退耕还林工程后续产业的几条措施。  相似文献   

神农架大九湖生物多样性及湿地恢复技术探讨     

杨仕煊  王兴林  吴翠 《湖北林业科技》2008,(3):42-44

大九湖湿地是湖北省境内海拔最高的高山湿地。笔者研究了大九湖的生物多样性,并对其进行了评价,提出了湿地的恢复技术。  相似文献   

丽江市退耕还林工程造林树种选择评析     

木伟军  赵宗桓 《林业调查规划》2008,33(1):78-82

介绍了丽江市退耕还林工程实施的基本情况和树种选择的详细情况,分析了工程所选择树种的结构及分布,对所选树种的造林成效进行了评价,分析指出了存在的问题,提出了丽江市退耕还林工程树种选择的相关建议,推荐了一些适合在丽江退耕还林工程中选用的树种.  相似文献   

云南省水电开发中森林资源的保护与恢复对策     

李维 《林业调查规划》2008,33(3):100-103

简要地介绍了云南省水能资源及开发的现状,从林业发展的角度分析了水电站开发对森林资源产生的正、负面影响,并提出水电开发中森林资源的恢复和保护对策.  相似文献   

陕西省山川秀美工程建设进展调查报告   总被引：2，自引：0，他引：2  

郭军文  陈谦 《水土保持通报》2000,20(5):1-4

山川秀美工程是陕西省实施西部大开发的首场战役。通过对陕西山川秀美工程建设进展情况的调查,明确了陕西省在贯彻落实朱rong基总理“退耕还林（草）”的重要批示中,创出了融退耕还林（草）于综合治理之中,走林牧双赢之路等工程建设的好经验。进一步明确了什么是山川秀美,以及实施山川秀美工程的总体布局问题。指出了当前山川秀美工程建设中存在的主要问题,并提出了有关重要意义。  相似文献   

高黎贡山地区生态环境变迁状况与重建对策     

武琢媛 《林业调查规划》2008,33(1):74-77

20世纪中叶以前,高黎贡山森林植被茂密,生态良好.如今,大面积的原始森林被砍伐,滑坡、泥石流自然灾害不时发生,生态环境恶化.通过对高黎贡山地区的生态环境恶化的原因进行分析,提出了5个方面的生态环境建设对策:(1)恢复植被;(2)开发替代能源以降低薪材消耗;(3)调整土地利用结构以发展社区经济;(4)发展生态旅游;(5)借助保护区的优势,争取国内外支持援助.  相似文献   

紫花苜蓿对草炭改良露天矿表土替代材料的响应   总被引：2，自引：2，他引：2  

位蓓蕾  胡振琪  张建勇  曾纪勇  蒋知栋 《农业环境科学学报》2013,32(10):2020-2026

为探讨添加草炭对露天矿表土替代材料的改良效果,以紫花苜蓿为试材,草炭为改良剂,研究了草炭添加量分别为0、10、30、50 g·kg-1（干土）与表土替代材料配合施用对紫花苜蓿生长性能及抗逆性能的影响。试验结果显示,添加草炭对紫花苜蓿生长期内的株高、生长率、生物量、叶片SPAD值、叶片的细胞膜透性、超氧化物歧化酶（SOD）活性、过氧化氢酶（CAT）活性、过氧化物酶（POD）活性及可溶性蛋白含量等指标均有显著影响（P<0.05）。草炭施用量为10 g·kg-1（干土）时,紫花苜蓿的株高、生长率、地上及地下部分  相似文献   

宁夏退牧还草工程植被特征研究     

曹廷  崔晋江  刘倩 《内蒙古草业》2013,(2):37-40

通过对宁夏灵武市草原退牧还草工程区草地植被特征的研究,结果表明:退化草地经围栏禁牧和补播后,由于有效消除了放牧的干扰,草地得到了休养生息,开始不断改善和恢复。主要表现在:禁牧加补播样地和禁牧样地地上生物量明显增加,平均比放牧样地高出87.03%和46.67%;禁牧加补播及禁牧样地植被盖度增大,分别比放牧草地提高了25.46%和15.37%;放牧区及禁牧区多为一年生植物,且区内的株丛数显著高于禁牧加补播区;在三个区内植物种类数和多样性指数没有差异显著性。综合评价,退牧还草工程的实施很好的改善了草地植被的生长效果。  相似文献   

Weather-Centric Rangeland Revegetation Planning     

Stuart P. Hardegree  John T. Abatzoglou  Mark W. Brunson  Matthew J. Germino  Katherine C. Hegewisch  Corey A. Moffet  David S. Pilliod  Bruce A. Roundy  Alex R. Boehm  Gwendwr R. Meredith 《Strength and Conditioning Journal》2018,71(1):1-11

Invasive annual weeds negatively impact ecosystem services and pose a major conservation threat on semiarid rangelands throughout the western United States. Rehabilitation of these rangelands is challenging due to interannual climate and subseasonal weather variability that impacts seed germination, seedling survival and establishment, annual weed dynamics, wildfire frequency, and soil stability. Rehabilitation and restoration outcomes could be improved by adopting a weather-centric approach that uses the full spectrum of available site-specific weather information from historical observations, seasonal climate forecasts, and climate-change projections. Climate data can be used retrospectively to interpret success or failure of past seedings by describing seasonal and longer-term patterns of environmental variability subsequent to planting. A more detailed evaluation of weather impacts on site conditions may yield more flexible adaptive-management strategies for rangeland restoration and rehabilitation, as well as provide estimates of transition probabilities between desirable and undesirable vegetation states. Skillful seasonal climate forecasts could greatly improve the cost efficiency of management treatments by limiting revegetation activities to time periods where forecasts suggest higher probabilities of successful seedling establishment. Climate-change projections are key to the application of current environmental models for development of mitigation and adaptation strategies and for management practices that require a multidecadal planning horizon. Adoption of new weather technology will require collaboration between land managers and revegetation specialists and modifications to the way we currently plan and conduct rangeland rehabilitation and restoration in the Intermountain West.  相似文献