拉脊山亚高寒草甸退化程度对土壤养分影响的研究

对亚高寒草甸土壤因素的调查分析,结果表明:全氮和全钾含量随退化程度的加深而减小,依次是轻度退化、中度退化和极度退化。随着草地退化程度的加剧,地上、地下生物量以及土壤全氮、全钾的含量也随之下降。不同退化程度间土壤全磷含量变化不明显,各层次之间虽然有上升趋势,但变化较小。全磷在土壤剖面中分布较均匀,说明退化强度对高山草甸草原土土壤全磷的影响相对较小。高寒草甸生态系统的恶化,不仅使群落物种组成发生了巨大变化,而且导致物种多样性发生改变,这与过度放牧和环境因子的影响程度有着密切的关系。

不同退耕还林措施下土壤水分养分影响试验研究

为对不同退耕还林措施下土壤水分养分影响进行探讨,采样野外试验观测方式针对辽西水土流失治理区封山育林、林草混交(刺槐和苜蓿)、刺槐沙棘混交、刺槐纯林等4种典型退耕还林措施下的土壤水分养分测定。结果表明:封山育林措施下土壤水分养分改善效果最佳,流失率最低,刺槐纯林模式下改善效果最低,流失率较高;相比于荒地各措施土壤含水率提高比例分别为14.25%(封山育林)、7.35%(林草混交)、2.84%(刺槐沙棘混交)、1.15%(刺槐纯林);相比于纯林措施,封山育林有机质和全氮可分别提高24.51%、24.35%,林草混交下有机质和全氮可分别提高23.88%、35.47%。封山育林措施适合于水土流失区生态重建模式应用和推广。

广西桑园土壤状况分析与施肥对策

从土壤类型、土壤元素缺丰分级、土壤主要限制因子等方面分析总结了广西桑园土壤的状况,分析了桑园土壤养分对桑叶产量和质量、养分缺乏对蚕体生长和茧丝生产的影响,提出注重肥料元素施用比例,注重不同区域桑园施肥差异、注重不同桑品种施肥差异、落实测土配方施肥方法等对策,得出大力推广应用平衡施肥理念的结论。

Relationship between the Water Body Chlorophylla and Water Quality Factors of Wetlands Baiguishan Reservoir

[Objective] The aim was to explore the relationship between water body Chlorophyll-a and water quality factors of wetlands Baiguishan reservoir.[Method] Chlorophyll-a and water quality factors of water quality of Wetlands BaiGuishan Reservoir was studied,the analysis of the relationship on water quality of Wetlands Baiguishan Reservoir was made by use of trophic status indices and SPSS17.0 statistical analysis.[Result] Total phosphorus was an important factor of influence Chlorophyll-a in reservoir,water body had slight eutrophication phenomenon in reservoir of July to October in 2010.[Conclusion] Comprehensive management should be strengthened so as to improve the water quality of Baiguishan wetland.