共查询到20条相似文献，搜索用时 171 毫秒
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四川盆地严重侵蚀坡面林业治理技术研究 总被引：3，自引：0，他引：3
四川盆地边缘山区坡面水土流失严重，制约了农林牧业发展。为改变这种状况，在“十年长江上游防护林工程”建设技术研究中开展了相关的治理研究。课题组人员根据四川盆地边缘山区的区域特点以及坡面侵蚀规律，在坡面防护林体系结构配置和林分结构配置模式的试验研究基础上，提出了在严重侵蚀坡面上通过林业工程治理、实现生态系统恢复，提高水土保持功能的技术措施。 相似文献
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《内蒙古林业调查设计》2016,(5):27-31
内蒙古土默特左旗大青山前坡及京藏高速公路两侧防护林体系建设,以维持大青山前坡及其山地与平原过渡地带生态系统的健康稳定,恢复和完善防护林体系多种功能为目标,坚持绿色发展、可持续发展理念,依据立地条件和经济社会发展需求,分区布局,分区施策。遵循造林学、景观生态学原理,设计了不同的造林模式,突破了防护林整齐划一传统的设计模式,将经济林、风景林、农田防护林有机结合,构建了稳定的、可持续的生态防护林体系。 相似文献
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冯汉华 《中南林业调查规划》2012,(1):28-31
深圳市沿海防护林体系包括生态风景林工程、林相改造工程、沿海防护林工程三大工程,工程建设始于2001年;截至2010年,10年间共营造防护林2.30万hm2,基本形成一道生态功能稳定的绿色屏障;总结深圳市沿海防护林体系建设的经验与问题,提出深圳沿海防护林体系工程的发展对策。 相似文献
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At present, the most researches on the protected effect of shelterbelt are on the basis of the two scales of forest belts and networks. However, with the further research on the global environmental change, more attention was paid to the regional climate effect of shelterbelt. In present study, we analyzed the temperature effect of the shelterbelt at regional scale by using the land surface temperature (LST) data from the moderate resolution imaging spectroradiometer (MODIS) at Yushu, Nong’an, Dehui, and Fuyu in Jilin Province of China from March to October in 2008. Results show that the shelterbelt can increase the soil temperature of the protected farmland as compared with no shelterbelt zone, with the increment of 0.57oC per day in fine shelterbelt and 0.38oC per day in the normal shelterbelt. Moreover, the correlation analysis of the air temperature, precipitation and the soil type and the shelterbelt effect shows that the air temperature and precipitation are negatively correlated with the shelterbelt effects, that is, the more the temperature and precipitation are, the less the effect produced. While the impact of the soil types on the shelterbelt’s effect is not very obvious as a whole. This paper draws significance in terms of analyzing the effects of the shelterbelt on the soil temperature at regional scale utilizing the remotely sensed data and GIS technique. 相似文献
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伊犁河流域丰产型农防林防护和增产效应研究 总被引：1，自引：1，他引：0
以干旱、半干旱区伊犁河流域察布查尔县境内新垦地丰产型小网格农防林为研究对象,对林网内农田和对照地的生态和经济效益进行了对比分析,结果表明:与对照地相比,农防林表现出强大的调节功能,林网内农田小气候得到明显改善,主要表现在各测点风速明显减小,空气温度降低、湿度增加,土壤温度日变化平缓等,只是距林缘不同距离的水平测点间,同一测点不同垂直高度间、一天中不同时段内各气象因子日变化规律差异均较大。另外,到目前为止,农防林对林内作物的增产效益也较明显,有防护林的油葵经济纯收益为对照地的1.25倍。 相似文献
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筏子溪位于我国台湾地区台中市区城市与乡镇结合的位置,有大面积的农田,常年多风害,农业生产环境不稳定。通过对农田林网的研究梳理及案例研究,归纳出林网的布局、林带的构成、树种的选择和作物的种植方式4个构建农田林网的要素。对筏子溪流域的农地从树种选择、林网构建、时序设计3个方面进行设计实践,完善农田林网景观的设计体系。最后,讨论了农田林网的生态效应、经济效益、文化服务3种景观服务功能。农田林网景观设计是农业生产应对全球气候变化和可持续发展的有效途径。 相似文献
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Mangala De Zoysa 《Small-Scale Forestry》2008,7(1):17-27
Growing of Casuarina equisetifolia as a small shelterbelt on the beach in Hambantotota City was implemented to protect the beautiful natural sand dunes, preserve
visual amenity and be a barrier to seawater salt spray. The casuarina shelterbelt has become popular because it was the only
undamaged area in Hambantota City after the devastating 2004 tsunami. The objective of the study was to assess the impacts
of the casuarina shelterbelt in economic, social and environmental terms. A survey was conducted to elicit observations and
experiences of city dwellers close to the shelterbelt. Respondents did not consider that the shelterbelt reduced wind speed.
Although the belt has increased the size of the sand dunes, the casuarina trees have suppressed the growth of native species
as an under-storey. The belt has improved the aesthetic value of the beach. No impact of the shelterbelt has been identified
in protecting agricultural crops and reducing the corrosion of household goods from seawater salt spray. The city dwellers
have not recognized the economic importance of casuarina timber but are impressed with the increase of fuelwood supply from
the shelterbelt. The shelterbelt has prevented illegal settlement, but facilitated anti-social and illegal activities among
lawless city dwellers. The attractiveness of the beach for tourism has been enhanced. Empirical evidence reveals that the
casuarina belt in Hambantota City has greater environmental and social impacts than economic impacts. 相似文献
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研究了无断根沟的17 a生一路双行毛白杨农田防护林的细根特征。结果表明,在距林带5.0m范围和100 cm深农田内的单位土体细根特征值为:根重92.20g/m3,根长641.01m/m3,根表面积1.058 8m2/m3,根体积103.7 cm3/m3,根尖数301 481个/m3。农田内的各细根特征值都随距林带的距离的增加而降低,基本上随着土壤深度先增加后降低,较高值出现在距林带1.5m范围内的20~40 cm或40~60 cm土层,在1.5m到3.0m的区间迅速或明显降低,在3.0m或5.0m以外则缓慢降低并且细根特征的最大值上升到10~20 cm土层。由此可见,根系胁地最强的范围应在距林带3m以内。 相似文献
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民勤绿洲防护林带作用下作物生长分析 总被引：6，自引：3，他引：3
本试验对比研究了小麦和玉米在枣树和杨树 2种农田防护林带作用下的生长状况和产量。结果表明 :枣树林带下的作物生长状况明显优于杨树林带。枣树林带下小麦的干物质积累速度高于杨树林带 51 4% ,致使生物产量相对杨树林带高 38 4%。不同种植方式小麦、玉米的粮食产量增加 4 2 %～ 13 0 %。增产的原因之一是枣树林带下作物不同生育期农田土壤含水率均高于杨树林带。可见枣树林带的胁地作用弱于杨树林带。推广枣树防护林 ,实现枣粮间作 ,是提高民勤绿洲农业产量的重要措施 相似文献