四子王旗2008年度京津风沙源治理工程建设全部达标

自治区沙源工程检查组专家对四子王旗2008年度京津风沙源治理工程的林业工程、水利工程、畜牧工程、生态移民工程进行了全面检查验收。检查验收工作以国家和自治区有关京津风沙源治理工程的管理办法。     

山西省桑干河杨树丰产林实验局京津风沙源治理二期工程规划探讨

京津风沙源治理工程实施以来,山西省桑干河杨树丰产林实验局(以下简称杨树局)认真贯彻落实国家、省关于京津风沙源治理工程的方针政策,按计划完成了上级下达的各项建设任务。2013年是京津风沙源治理二期工程的启动年。笔者根据杨树局森林资源状况和所承担的京津风沙源治理二期工程任务,对二期工程规划进行了探讨。一、京津风沙源治理一期工程取得的成效1、按计划完成了上级下达的工程建设任务     

京津风沙源治理和退耕还林工程对农户生活消费影响分析

京津风沙源治理及退耕还林工程是我国重要生态工程,比较分析表明：2007年,京津风沙源治理工程在交通方面比退耕还林工程多支出172.23元、衣着方面多支出416.96元、居住方面少支出1186.71元、食品方面少支出1930.78元、其他方面多支出1479.67元,总计少支出1048.63元。2008年,京津风沙源治理工程在交通方面比退耕还林工程少支出44.85元、衣着方面多支出447.49元、居住方面少支出1499.67元、食品方面少支出1932.37元、其他方面多支出1963.72元,总计少支出1065.68元。     

京津风沙源治理和退耕还林工程区农户支出分析

2007年项目区农户总消费支出中,京津风沙源治理工程项目区农户,在生活消费方面比退耕还林工程项目区农户少支出1080.54元,医疗消费方面多支出241.89元,教育消费方面多支出1412.02元,总计多支出717.20元。2008年,京津风沙源治理工程项目区农户,在生活消费方面比退耕还林工程项目区农户少支出1249.88元,医疗消费方面多支出374.14元,教育消费方面多支出1469.13元,总计多支出1079.31元。结果表明,京津风沙源治理工程项目区农民生活水平高于退耕还林工程项目区的农民。     

《内蒙古林业》征稿启示

为配合国家京津风沙源治理工程十周年，按照国家林业局治沙办公室《京津风沙源治理工程十周年宣传工作方案》和内蒙古自治区林业厅《关于开展京津风沙源治理工程质量年和宣传年活动的通知》，精神，     

总结经验加大投入巩固成果(摘要)

9月中旬,我借在内蒙古参加全国粮食主产区工作会议的机会,用六天时间从呼和浩特到乌兰察布盟、锡林郭勒盟、赤峰市,沿着京津风沙源跑了一遍。我亲眼看到,几年来所实施的京津风沙源治理工程,还有得到世界银行支持的三北防护林工程,在抑制荒漠化、生态治理方面已经产生了非常好的     

内蒙古京津风沙源治理工程封山（沙）育林回顾

内蒙古自治区实施京津风沙源治理工程近10年，取得了显著成效，积累了丰富的经验。回顾京津风沙源治理工程封山（沙）育林历程，总结经验，查找问题，研究对策，对深入推进京津风沙源治理工程的实施，具有十分重要的意义。     

左云县京津风沙源治理工程建设经验探讨

京津风沙源治理工程是国家林业重点工程之一。介绍了左云县实施京津风沙源治理工程10年来的主要做法以及取得的成就。     

山西省京津风沙源治理工程建设效益研究

京津风沙源治理工程是国家的大型生态建设工程。本文介绍了山西省京津风沙源治理工程区自然条件及土地资源变化情况、建设范围、进展情况以及工程实施九年来取得的主要成就。     

京津风沙源治理工程开始全面启动

《京津风沙源治理工程规划》目前获国务院批准。全国六大林业重点工程之一的京津风沙源治理工程,在历经两年试点的基础上现在全面启动实施。 工程计划用10年时间,通过采取对现有植被的保护、封     

Productivity and nutrient uptake of newly released wheat varieties at different sowing times under poplar plantation in north-western India

Standardisation of cultural practises is one of the primary objectives to make the system ecologically sustainable and economically viable. In this context, the present study was conducted to optimise the time of sowing in relation to newly released wheat varieties under 4–6 year old poplar block plantation. Six widely grown wheat varieties (PBW 502, PBW 343, WH 542, PDW 274, PBW 509 and PBW 373) were intercultivated during three consecutive crop growth seasons at three times of sowing (mid November, late November and mid December) under block plantation of poplar (Populus deltoides Bartr.) clone G-48. The grain yield and nutrient uptake of wheat varieties was higher in open conditions than under the trees. The wheat variety PBW 502 out yielded the rest of wheat varieties over different sowing times. The highest grain yield was recorded when crop was sown during mid November over the 3 years. Thus adoption of PBW 502 under poplar plantation would substantially improve the overall productivity of the system without any additional input cost. All the varieties performed better when sown early compared to one-month delay. The various growth parameters like tiller height and number, spike length and 100 grain weight contributed significantly towards higher grain yield in early sown conditions (mid November) under poplar irrespective of its age of plantation. The nutrient uptake (N, P and K) by wheat straw and grain was higher in early sown crop with longer growth span than the late sown crop. The higher quantity of N, P and K was removed from soil by PBW 509, PBW 373 and PBW 343, respectively.     

The effects of alley cropping withLeucaena leucocephala and of different management practices on the productivity of maize and soil chemical properties in lowland coastal Kenya

The effects of leucaena hedgerows, mulching with leucaena foliage (0,50 and 100% of harvested foliage), cowpea intercropping and adition of dairy cattle slurry (55 t ha^–1 per maize crop) on the yield of maize from a sandy soil were assessed. The four-year results from five maize crops are reported.Except in the first year, yields of maize grain and stover were significantly reduced by 30% in the presence of leucaena hedgerows. Use of leucaena mulch eliminated this effect; application of all the harvested leucaena mulch (100%) increased the total maize grain yield of the five crops by 44% over sole maize. Hedgerow and mulching management required an additional 36 mandays labour ha^–1 which was more than compensated by the increased maize yields. Furthermore leucaena hedgerows substantially depressed the growth of weeds between cropping seasons.Intercropping with cowpea significantly depressed yields of maize grain and stover when both crops were sown together, but not in later seasons when cowpea was sown four weeks after the maize. Application of slurry increased the total yields of maize grain and stover by 35 and 37%, respectively. The grain yield of maize in leucaena hedgerow treatments fertilized with slurry did not respond to application of more than 50% of leucaena foliage, which suggested that half of the foliage could be spared for feeding to livestock. The cumulative yield of maize grain from the highest yielding organic system was 85% of the yield from the fertilizer treatment.The study, which is continuing, demonstrates that large increases in agricultural productivity are possible through the intercropping of maize with woody forage and grain legumes and the integration of dairy cattle production into the system. It thus shows the importance of exploiting crop/livestock interactions.     

新一轮退耕地还林实施情况探析 ——以湖南省为例

结合2019年新一轮退耕地还林国家级检查验收,对湖南省退耕还林保存面积、成林面积和工程管理情况进行抽样检查.分析结果发现存在退耕地类认定部门间沟通不足,退耕还林地保存状况有待改善,"重造轻管"导致退耕地成林率较低,不动产权发证工作滞后,地方财政支持力度有待加强等问题,并提出认真落实退耕地类认定,及时整改保存状况存在的问...     

Yield components and phenology of durum wheat in a Mediterranean alley-cropping system

It is often claimed that agroforestry could increase the total productivity per land unit compared to monocropping systems. The aim of this study was to evaluate, in a sub-humid Mediterranean climate, the behavior of the yield components, phenology, LAI and NDVI of durum wheat in an alley-cropping system. Our hypothesis was that the microclimate changes in agroforestry could change the devlelopment and yield of cereals. Two different experiments were carried out: in 2015 under 16-year old poplars in East–West lines and in 2016 under 21-year-old ash trees in North–South lines. In each experiment, 12 genotypes of durum wheat were sown. The grain yield was not significantly different in agroforestry and full sun conditions in 2015; however, both systems in this experiment had a particularly low yield (≈ 10% of the historical average yield of the plot). In 2016, the grain yield was significantly lower in agroforestry in comparison with full sun conditions. In both experiments, the most impacted yield component by agroforestry was the number of grains per spike. Similarly, in both experiments, the number of grains per spike was the only yield component impacted by the position within the alley inside agroforestry. Surprisingly, in 2016 the grain yield was higher in the West than in the center position of the alley. In both experiments, agroforestry delayed the maturity of the crop. The use of standard growing degree days was not sufficient to explain the difference in phenology between agroforestry and full sun conditions.     

三峡库区退耕还林方式探讨

三峡库区地形和自然地质条件复杂,是我国水土流失最为严重的地区之一[1],三峡库区水土流失治理是事关库区生态环境改善的成败和三峡工程长久安全运行的大事。笔者通过对巴东县官渡口镇退耕还林现状的调查,分析三峡库区退耕还林与农民生活出路之间存在问题的基础上,提出了三峡库区第一重山脊内实施退耕还林的措施和办法。为有效改善三峡库区水土流失提供技术支持。     

Germination and early growth of sown Quercus robur L. in relation to soil preparation, sowing depths and prevention against predation

A field experiment was established in the autumn of 1992 in order to study predation of acorns, germination and early growth of oak seedlings. The experiment was established on a clearcut and an adjacent oak shelterwood in southern Sweden. In the experiment, a total of 6 840 acorns were sown. The sowing was carried out with different vegetation control and soil preparation treatments and with different planting depths.The germination percentage was highest for acorns sown at five cm depth and lowest for acorns sown on top of the soil, and lower for acorns sown in areas where the humus layer had been removed than in areas where the humus layer was retained. There was no difference in the percentage germination after two growing seasons between acorns sown inside the shelterwood and acorns sown on the clearcut. The height of the seedlings was lowest when the humus was removed while the number of leaves per seedling was lowest for seedlings in untreated areas after two growing seasons. Furthermore, seedlings in untreated areas showed the lowest relative height growth rate during the second growing season. In spite of higher biomass of ground vegetation in undisturbed areas compared to treated areas, no effect of the soil and vegetation control treatments could be found on soil water potentials. The soil temperature and photosynthetic active radiation at seedling level were higher in areas where soil preparation and vegetation control had been performed. However, it was concluded that neither low soil water availability nor low light levels could be the only cause of lower relative height growth rate during the second growing season for seedlings in undisturbed areas.     

偏关县退耕还林地植物种类调查研究

以偏关县退耕还林地为研究对象,应用生态学原理和方法,调查退耕还林地的植物种类。结果表明,偏关县退耕地植物共有34科,77属,95种。2000年,2001年和2002年退耕地的植物高度分别比对照区增加了19．8cm,16．2em,7．0cm;植被相对盖度分别增加了47．6％,42．4％和33．1％．退耕地的植物生长发育速度比对照区快。     

不同立地类型条件柠条播种造林苗期生长情况初步研究

通过对浑善达克沙地实验地4种立地类型柠条播种苗的实际跟踪调查,初步摸清了柠条在该区域的生长表现情况。调查结果表明:4种立地类型下按生长状况由好到次的顺序排列是,流动沙丘半固定沙丘风蚀沟丘间低地,物种间的竞争是影响当年生柠条播种苗生长好坏的最主要原因。     

河南省太行山区经济林适度经营规模模糊综合评判研究

本文选用 7个反映经济林生产及经济收入的指标 ,应用模糊综合评判的方法 ,对农户不同的经营规模给予综合评价 ,结果表明 ,在保证粮食生产的前提下 ,年人均种植 7 5亩 ,经济林面积占总面积的 80— 90 % ,可形成合理的粮果配置结构     

我国的采脂松树资源和松脂贮量——基于"连清"数据的估测

应用已经公布的第6次全国森林资源连续清查数据对我国的采脂松树资源和松脂贮量进行估测分析,探索一条有效实用科学的松脂储量计算方法和途径,提出按"连清"数据中可采脂龄级计算采脂松树资源,用可采脂径级统计的株数进行松脂贮量估测的方法.通过计算,得出全国目前可采脂松树资源为316.65万hm~2,松脂贮量为162.5万t·a~(-1).论证分析我国各省(市)区松脂资源的分布和存贮量.