新时代国有林场改革的若干问题探讨     

刘艺玮 《现代农业科技》2021,23(23)

国有林场是我国生态文明建设的主力军。随着我国城市化建设步伐的不断加速,生态环境问题业日益突出,如何在保护生态环境的同时,加快经济建设的发展,成为当今林业领域的热点研究问题。本文从国有林场改革的意义、公益性国有林场的特点、国有林场改革的思路及建议、国有林场发展的方向及途径、国有林场可持续发展的措施等方面进行了探讨,以期为国有林场的发展提供借鉴。  相似文献   

内蒙古高原紫花苜蓿土壤氮素丰缺指标和推荐施氮量     

米春娇  孙洪仁  王显国  高凯  张玉霞  刘庭玉 《草地学报》2021,29(12):2785-2791

为了给内蒙古高原紫花苜蓿（Medicago sativa L.）测土施氮奠定科学基础，本研究采用“零散实验数据整合法”和“养分平衡-地力差减法”新应用公式，开展了该自然区域紫花苜蓿土壤氮素丰缺指标和推荐施氮量研究。结果表明：内蒙古高原生长第1年紫花苜蓿土壤碱解氮第1~6级丰缺指标为≥48，20~48，8~20，4~8，2~4和<2 mg·kg^-1，土壤全氮第1~5级丰缺指标为≥1.4，0.8~1.4，0.4~0.8，0.2~0.4和<0.2 g·kg^-1，土壤有机质第1~6级丰缺指标为≥17，10~17，6~10，3~6，2~3和<2 g·kg^-1。当紫花苜蓿目标产量9~18 t·hm^-2、氮肥利用率40%时，内蒙古高原紫花苜蓿第1~6级土壤推荐施氮量分别为0，68~135，135~270，203~405，270~540和338~675 kg·hm^-2。  相似文献   

不同有机物对铁皮石斛试管苗生长发育的影响     

周江明 《勤云标准版测试》2005,(5)

研究不同有机物浸提液对铁皮石斛试管苗生长的影响。在相同的培养条件下，以8种含有不同有机物的培养基培养试管苗，60d后对试管苗的各种性状进行记录统计，并与对照（没加有机物提取液）进行比较分析。结果不同的有机物浸提液对试管苗的影响效果不一样。壮苗以加入白萝卜提取液、CH和CM为佳，生根以加入香蕉提取液为佳，要提高繁殖系数以不加有机物为佳。  相似文献   

试论福建省国营林场分类管理     

王光玉 《福建林学院学报》1989,(Z1)

本文分析了福建省110个国营林场的类型、目前管理体制、管理办法及存在的问题。指出了目前国营林场管理办法中存在着种种弊端,跟深化林业改革很不适应,必须改革和完善国营林场管理机制,理顺“省办地管县监督”的管理体制,实行分类指导。本文就分类管理的依据,原则和实施办法进行了探讨,并提出了一些建议。  相似文献   

碧峰峡森林土壤性状研究   总被引：1，自引：0，他引：1  

李叔南  夏建国 《四川林业科技》1995,16(4):13-19

碧峰峡不仅是旅游景点,还是多学科研究的天然“实验室”,地处雅安亚热带区,原始森林植被保护完好,土壤垂直分布明显,地质现象复杂,也是大熊猫、金丝猴出没之地。经研究结果：土壤呈酸性,自然肥力高．经相关分析结果：土壤有机质含量和ＣＥＣ等有关理化特性的相关性,较物理性粘粒与ＣＥＣ间更加显著。  相似文献   

Environmental assessment tools for the evaluation and improvement of European livestock production systems   总被引：1，自引：0，他引：1  

Niels Halberg  Hayo M.G. van der Werf  Randi Dalgaard 《Livestock Production Science》2005,96(1):33-50

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规模化猪场粪污处理技术研究进展   总被引：13，自引：0，他引：13  

汪善锋陈安国  汪海峰 《家畜生态》2004,25(1):49-54

我国规模化猪场的兴起与粪污处理的相对滞后，使养殖业对环境的污染日益严重，畜牧场的污染问题已越来越受到人们的关注和重视。通过营养调控的方式可以提高动物对养分利用率，从而减少动物代谢废物的排泄量，但动物的粪污排泄量仍大大超出环境的承受能力，因此必须加强猪场废弃物和污水的综合治理。本文就国内外粪污处理技术和(粪)污水处理的工艺等方面研究近况作一综述。  相似文献   

Determination and Analysis of Heavy Metal Content in the Soil from Beef Cattle Farms in Three Regions of Xinjiang     

ZHANG Chao  LIU Ying-yu  ZHANG Xiao-hong  Wumaierjiang  YAO Gang 《中国畜牧兽医》2016,43(5):1244-1249

In order to study and evaluate the feeding environment of the beef cattle farms in Xinjiang, the contents of heavy mentals in the soil from 8 beef cattle farms in Xinjiang Aksu, Yili and Tacheng regions were tested according to the Field of Livestock and Poultry Environment Quality Standard (NY/T 388—1999).The atomic absorption spectroscopic method was used to determine the contents of As, Hg, Pb, Cd, and Cr.The mean contents of As, Hg, Pb, Cd, and Cr in 8 beef cattle farms soil were 0.389, 0.568, 22.708, 0.573 and 149.449 mg/kg, respectively, and they were all below the upper limit of NY/T 388—1999.The comprehensive heavy metal pollution index of 8 beef cattle farms were 0.577 to 0.994, and the index were 0.7 to 1 of two observation points in Yili and one observation point in Tacheng.The soil environment quality of these 3 farms were at the level of slight cleaning.The comprehensive heavy metal pollution index of other five observation points were ≤0.7, the soil environment was in a clean level.The soil environment of beef cattle farms in these three regions conformed to the standards of livestock for environment quality and safe products.  相似文献   

Soil bacterial phoD gene abundance and expression in response to applied phosphorus and long-term management     

《Soil biology & biochemistry》2015

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Sewage sludge processing determines its impact on soil microbial community structure and function     

《Applied soil ecology》2014

Composting and thermal drying are amongst the most commonly used post-digestion processes for allowing sanitation and biological stabilization of sewage sludge from municipal treatment plants, and making it suitable as soil conditioner for use in agriculture. To assess the impact of sludge-derived materials on soil microbial properties, fresh (LAF), composted (LAC) and thermally dried (LAT) sludge fractions, each resulting from a different post-treatment process of a same aerobically digested sewage sludge, were added at 1% (w/w) application rate on two contrasting (a loam and a loamy sand) soils and incubated under laboratory conditions for 28 days. Soil respiration, microbial ATP content, hydrolytic activities and arginine ammonification rate were monitored throughout the incubation period. Results showed that soil biochemical variables, including the metabolic quotient (qCO₂), were markedly stimulated after sludge application, and the magnitude of this stimulatory effect was dependent on sludge type (precisely LAT > LAF > LAC), but not on soil type. This effect was related to the content of stable organic matter, which was lower in LAT. Genetic fingerprinting by PCR–DGGE revealed that compositional shifts of soil bacterial and, at greater extent, actinobacterial communities were responsive to the amendment with a differing sludge fraction. The observed time-dependent changes in the DGGE profiles of amended soils reflected the microbial turnover dependent on the sludge nutrient input, whereas no indications of adverse effects of sludge-borne contaminants were noted. Our findings indicate that composting rather thermal drying can represent a more appropriate post-digestion process to make sewage sludge suitable for use as soil conditioner in agriculture.  相似文献