林下间种作物对杨树幼林生长量的影响

通过在1年生、2年生辽育1号杨树幼林内间种玉米、大豆、西瓜、向日葵4种作物,研究了这些作物对杨树幼林生长量的影响。结果表明:间种不同作物对辽育1号杨树幼林生长量的影响差异较大,其中间种西瓜、大豆等矮棵作物优势更为明显,间种玉米、向日葵等高棵作物效果不如间种西瓜、大豆等矮棵作物。建议在辽西地区杨树人工林内多选择对水分需求较多的作物间种,以解决杨树生产中对水分的需求,为其丰产创造条件。     

不同间作模式对白木香幼林生长的影响

对不同间种模式白木香幼林的生长情况进行分析比较,结果显示:间作作物可有效提高幼林保存率;3种间作模式以间种花生的间作效果表现最好,其次是间种西瓜,最差的是间种番薯.     

杨树人工林 幼林间种作物效果分析

测定分析了杨树人工幼林间种不同作物的技术经济效果,结果表明:林下间种作物能提高林地土壤养分含量,改善林木树体营养状况,3年生林分林木单株材积较对照(不间种)提高7.1%~23.2%,间种作物有明显的经济收入。     

当年栽树当年富

如何做到当年栽树当年富呢?关键在因地制宜,在全垦的幼林地上,套种木薯、花生、玉米、黄豆、高粱、生羌、砂仁、芝麻、芋头、金银花等作物,以种代管,既给幼林遮荫,又促进其生长,年中要给     

不同间作模式对油茶幼林病虫害的影响

为分析林农间作对油茶幼林病虫害影响的情况,并制定相关的病虫害良好预防及控制的模式,针对油茶幼林当作所间作种植的大豆、金银花、花生3种作物不同间作模式对病虫害的影响情况进行了试验、调查与回归分析,研究结果表明:金银花、大豆及花生3种间作模式对油茶幼林病虫害的控制均有一定影响;统计分析结果表明:3种间作模式中间作金银花达到的处理效果是最好的。3种间作模式均显著影响油茶主要病虫害的发生,回归分析结果可以看出:间作大豆是调控病虫害发生最适用的一种间作模式,利用这种间作模式可以有效地达到调控油茶幼林生态情况的目的,可促进种植作物经济效益的提高。     

不同因素对杉幼林生长影响的研究

本研究采用重复正交设计方法，对在杉木迹地上再造杉木树的幼林中进行整地方式、密度、间种作物、肥料、抚育、间伐等因子的重复正交设计试验研究。通过几年的观察记载分析得出，在密度为２００株的幼林中间种黄豆和适当施磷肥效果最佳。     

杨树人工林幼林间种作物效果分析

测定分析了杨树人工幼林间种不同作物的技术经济效果，结果表明：林下间种作物能提高林地土壤养分含量，改善林木树体营养状况，３年生林分林木单株材积较对照（不间种）提高７．１％－３２．２％，间种作物有明显的经济收入。     

怎样选择林粮间作作物

“两山”划定之后,新造林地很多,但是,林木生长年限长,从苗木栽植到幼林完全郁闭,有相当长的年数。在此期间,在不妨碍林木生长(甚至还会促进林木生长)的基本条件下,可以在一定年限内,在幼林内利用其行间或株间的空间,间作一些收获期较短的农作物(包括粮食、油料、蔬菜、药材、特种经济作物等)。这样,既能充分利用地力、增加副业收入,以短养长,长短结合,开展多种经营;又能在管理间作作物的同时抚育幼林。这     

林粮间作对银杏叶枯病发生的影响

在银杏幼林间种蚕豆作物,有利于银杏的良好生长,抑制早期黄化病的出现,还可以促进银杏落叶分解,降低链格孢菌存活数量及其产生分生孢子的能力,从而减少叶枯病的初次侵染源,减轻该病的发生与危害。     

杨树间种最佳作物的选择试验

杨树速生丰产林在幼龄林阶段,科学地选择间种农作物和合理地搭配种植,不仅能促进幼林的生长发育,还可获得很高的经济效益,可谓一举双得;但若间种作物选得不当或搭配不洽,也会造成适得其反的效果。     

间种对油茶幼林生长的影响及效益分析

选用黄豆、花生、红薯和烟叶4种农作物于油茶幼林内进行间作,研究不同间种模式对油茶幼树树体生长的影响,并对间种不同经济作物的油茶幼林林地经济效益进行分析。结果表明:间种可促进油茶幼林的生长,其中间种黄豆效果最好,树高增加了0.11 m,地径增加了0.04 cm,冠幅增加了0.21 m~2,花芽数增加了20个/枝。间种可增加油茶幼林的经济效益,其中间种烟叶效益最高,经济产出为48 960元/hm~2。综合来看,油茶幼林间种的经济作物宜选择较矮小、具根瘤固氮菌的花生、黄豆。     

黄河故道沙地杨树人工林不同间作方式的比较

The orthogonal experiment of different factors in 6-year-old poplar stands,including intereropping crops, appli-cation rate of fertilizer, and planting density of forest tree etc., was carried out in the sandland of the Yellow River original course. The results indicated that doing intereropping, enlarging the row spacing and prolonging the time of intereropping were the effective ways by which the needs of forest tree for nutrients could be applied, and the level of forest land produc-tivity could be increased. Meanwhile, the optimum intercropping way of poplar plantations at different ages was gound, which was useful for the site of tne present experiment.     

阜新北部沙地宽冠型杨树林下间种紫花苜蓿模式初探

林草间作可以科学合理的利用空间,改善区域气候,增强土壤肥力,促进树木生长,增加农民收入,为畜牧业发展提供原料,促进林业、草业、牧业的协调发展,从而取得较好的生态、经济和社会效益。作者通过对比试验,对杨树林下不同间种模式效益进行综合分析,得出阜新北部沙地宽冠型杨树林株行距为4m×6m时,林下种植紫花苜蓿能获得最好的生态效益和较好经济效益。     

Carbon stocks and biomass production of three different agroforestry systems in the temperate desert region of northwestern China

Carbon sequestration potential of agroforestry systems has attracted worldwide attention following the recognition of agroforestry as a greenhouse gas mitigation strategy. However, little is known about carbon stocks in poplar–maize intercropping systems in arid regions of China. This study was conducted in the temperate desert region of northwestern China, a region with large area of poplar–maize intercropping systems. The objective of this study was to assess biomass production and carbon stock under three poplar–maize intercropping systems (configuration A, 177 trees ha^?1; configuration B, 231 trees ha^?1; and configuration C, 269 trees ha^?1). We observed a significant difference in the carbon stock of poplar trees between the three configurations, with the highest value of 36.46 t ha^?1 in configuration C. The highest carbon stock of maize was achieved in configuration B, which was significantly higher than configuration A. The grain yield was highest in configuration A, but there was no significant difference from the other two configurations. In the soil system (0–100 cm depth), the total carbon stock was highest in configuration C (77.37 t ha^?1). The results of this study suggest that configuration C is the optimum agroforestry system in terms of both economic benefits and carbon sequestration.     

Biomass production and carbon stocks in poplar-crop intercropping systems: a case study in northwestern Jiangsu,China

The importance of agroforestry systems in CO₂ mitigation has become recognized worldwide in recent years. However, little is known about carbon (C) sequestered in poplar intercropping systems. The main objective of this study is to compare the effects of three poplar intercropping designs (configuration A: 250 trees ha⁻¹; configuration B: 167 trees ha⁻¹ and configuration C: 94 trees ha⁻¹) and two intercropping systems (wheat–corn cropping system and wheat–soybean cropping system) on biomass production and C stocks in poplar intercropping systems. The experiment was conducted at Suqian Ecological Demonstration Garden of fast-growing poplar plantations in northwestern Jiangsu. A significant difference in C concentration was observed among the poplar biomass components investigated (P ≤ 0.05), with the highest value in stemwood and the lowest in fine roots, ranging from 459.9 to 526.7 g kg⁻¹. There was also a significant difference in C concentration among the different crop components (P ≤ 0.05), and the highest concentration was observed in the corn ear. Over the 5-year period, the total poplar biomass increased with increasing tree density, ranging from 8.77 to 15.12 t ha⁻¹, while annual biomass production among the crops ranged from 4.69 to 16.58 t ha⁻¹ in the three configurations. Overall, total C stock in the poplar intercropping system was affected by configurations and cropping systems, and configuration A obtained the largest total C stock, reaching 16.7 t C ha⁻¹ for the wheat–soybean cropping system and 18.9 t C ha⁻¹ for the wheat–corn cropping system. Results from this case study suggest that configuration A was a relative optimum poplar intercropping system both for economic benefits and for C sequestration.     

Spatial and temporal distribution of earthworms in a temperate intercropping system in southern Ontario, Canada

Earthworms are known to increase soil bulk density, soil porosity, mixing of organic matter, and to strengthen aggregation of soil particles. They perform important functions in the maintenance and stabilization of the soil matrix. Historically, temperate intercropping research has focused on the above-ground benefits of adding trees into the agricultural landscape. Earthworm research in temperate intercropping systems has been non-existent to date. More emphasis on studying below-ground components, such as earthworms, is required in order to better understand the mechanisms of intercropping ecosystem function. The purpose of this study was to examine seasonal changes in distribution and abundance of earthworms under a temperate intercropping system in southwestern Ontario, Canada. Sampling occurred during the spring and summer of 1997 at the University of Guelph's Agroforestry Research Station, Guelph, Ontario. Earthworm samples were collected at various distances from the tree rows. Significant variation in both earthworm biomass and density were found between the three tree species sampled. Total mean earthworm density was 182 m^-2 within the poplar rows, 71 m^-2 within the silver maple rows, and 90 m^-2 within the white ash rows. A marked difference was also observed in the distribution of earthworms within the tree rows and the field area. For example, total mean density within the tree rows for poplar was 182 individuals m^-2, as compared to total mean densities of 117 and 95 individuals m^-2, two metres and six metres into the field from the tree, respectively. This revised version was published online in June 2006 with corrections to the Cover Date.     

鲁西黄河故道杨树林间作效益的研究

经过6年对鲁西黄河故道杨树人工林进行施肥量、间作物、密度等因素的正交试验，证明只有扩大造林行距为10m左右，造林后立即实行林下间作，并尽量延长间作年限，才能保证树体营养供应和林木正常生长，提高林地的生产力和经济效益。同时，探索出在此类土地上不同林龄的杨树人工林的最佳间作方式。     

林药间作系统中药用植物光合生理适应性规律研究

通过设置不同毛白杨行距梯度,观测了不同毛白杨行距以及同一行距下的不同林地位置间作的甘草,桔梗,天南星3种耐荫性不同的药用植物的叶绿素荧光参数的差异,分析了3种药用植物的光合日进程和日平均净光合速率的变化规律,从而得出了不同药用植物对间作环境适应的生理生态学机制,为林区开展多种经营以及我国西部退耕还林还草工程区发展林药间作模式提供必要的理论依据。     

黄河故道沙地不同间作模式林粮产量的比较

通过对山东省黄河故道冲积沙地间作花生、大豆、地瓜3种林粮间作模式的林分杨树胸径生长量、蓄积量、林地木材产量、间作作物产量及其经济效益的对比分析,结果表明:3种间作模式下,杨树胸径的连年生长量、单株蓄积量、林地蓄积量、木材产量均表现为间作花生>间作大豆>间作地瓜。间作花生、间作大豆、间作地瓜模式第10年的胸径累积生长量分别为39.96,37.89和34.03 cm,木材总产量为700.50、664.13和584.40 m3.hm-2。间作作物产量以第2年最高,第3年最低,3 a后不宜间作。不同林粮间作模式,以花生的木材产量最高,经济效益最大,大豆次之,地瓜最差,因此应选取豆科植物作为间作作物。     

江汉平原典型杨－农复合经营模式及效益分析

通过连续3年试验监测,对江汉平原5种典型杨-农复合经营模式及效益进行了分析.结果表明：杨树幼林农林间作不仅能促进杨树生长,还可以获得明显经济效益.不同间作模式收益及影响杨树生长有差异,综合效益较好的模式有：杨树＋西瓜＋小麦、杨树＋棉花＋小麦和杨树＋玉米＋小麦.