Photosynthesis, growth and yield of soybean and maize in a tree-based agroforestry intercropping system on the Loess Plateau
Photosynthesis, growth and yield of soybean and maize in a tree-based agroforestry intercropping system on the Loess Plateau
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DOI：
10.1007/s10457-009-9227-9
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发表时间：
2009-07-01
影响因子：
2.2
通讯作者：
Zhang, Shuoxin
中科院分区：
文献类型：
--
作者：
Peng, Xiaobang;Zhang, Yuanying;Zhang, Shuoxin
农林复合经营是黄土高原退耕还林还草、发展贫困地区经济的最有效途径。为了最大限度地发挥林木间作系统的潜在效益，通过测定4年生核桃林的光合作用有效辐射(PAR)、植株水分亏缺和土壤水分，研究了大豆和玉米的光合作用、生长和产量。和李(Prunus Salicina)，在黄土高原上以5m×3m的间距生长。树木竞争的影响显著降低了离树行较近的大豆或玉米植株的PAR、净同化(NA)、生长和产量。NA与两种作物的生长发育和产量均呈高度相关。玉米比大豆的相关性更高，玉米而不是大豆受到树荫的负面影响更大。在PAR和NA上，李子的竞争效应最大，核桃次之。两种作物的日水分亏缺与净光合速率、生长发育和产量的相关性不显著且不显著。然而，土壤水分(20 cm深)与两种作物的生物量和产量显著相关。讨论了可能的补救策略，以减少树木对农作物的竞争相互作用。
Agroforestry is the most effective way to restore the disturbed lands on the Loess Plateau and to develop the poor local economy. In order to maximize the potential benefits of tree-based intercropping systems, photosynthesis, growth and yield of soybean and corn were studied by measuring photosynthetic active radiation (PAR), plant water deficit and soil moisture in a 4-year-old plantation of walnut (Juglans regia L.) and plum (Prunus salicina) grown at a spacing of 5 m x 3 m on the Loess Plateau. The effects of tree competition significantly reduced PAR, net assimilation (NA), growth and yield of individual soybean or corn plants growing nearer (1 m near tree row) to tree rows. NA was highly correlated with growth and yield of the both crops. These correlations were higher for corn than soybeans, with corn, rather than soybeans being more adversely impacted by tree shading. Plum, rather than walnut had the greatest competitive effect on PAR and NA. Daily plant water deficits were non-significantly and poorly correlated with NA and growth and yield of the both crops. However, soil moisture (20 cm depth) was significantly correlated with biomass and yield of both crops. Possible remediation strategies are discussed to reduce tree competitive interactions on agricultural crops.