Temporal and spatial distribution of roots as affected by interspecific interactions in a young walnut/wheat alley cropping system in northwest China
Temporal and spatial distribution of roots as affected by interspecific interactions in a young walnut/wheat alley cropping system in northwest China
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中国西北地区核桃/小麦幼苗种植系统中种间相互作用对根系时空分布的影响
DOI：
10.1007/s10457-014-9770-x
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发表时间：
2015-04
影响因子：
2.2
通讯作者：
Li L.
中科院分区：
文献类型：
--
作者：
Zhang W.;Ahanbieke P.;Wang B. J.;Gan Y. W.;Li L. H.;Christie P.;Li L.
间作波斯核桃(Juglans RegiaL.)和小麦(Triticum aestivumLinn.)在西北地区，中国正受到越来越多的关注，因为它在提高土地利用效率、增加农民经济效益和增强作物生产的可持续性方面具有潜在优势。在中国西北部南疆和田老绿洲，利用波斯核桃幼树与小麦组成的系统进行了为期两年的大田间作试验，测定了两种核桃幼树与小麦之间的根系竞争作用、地上生物量和间作系统各组成部分的经济产量。在波斯核桃树/小麦间作系统以及单作小麦和单作核桃系统中，用螺旋钻采集根部，直到土壤剖面中1米深。结果表明，林木根系向下伸展，间作小麦根系在土壤剖面上呈浅层分布。2012年，核桃和小麦间作的根长密度和根径均低于单作核桃树和小麦，而比根长则高于单作核桃树和小麦。虽然地下根系竞争导致两种作物的产量和生物量下降，但与单一作物相比，波斯核桃和小麦间作提高了植物生长资源的利用率。两种间作年间作树高、胸径和平均冠径均低于单作。我们得出结论，物种间的相互作用主要发生在被调查物种之间的地下竞争。对土壤资源的竞争是小麦产量的主要限制因素。需要进一步的研究来检验间作系统中树龄不断增长的物种相互作用的动态过程。
Intercropping Persian walnut (Juglans regiaL.) and wheat (Triticum aestivumLinn.) in northwest China is receiving increasing attention because it offers potential advantages for improving land-use efficiency, increasing economic returns to farmers and increased sustainability in crop production. We carried out a two-year field intercropping experiment, using a system composed of young Persian walnut trees with wheat to determine the root competitive interactions between the two species, aboveground biomass and the economic yield of each component of the intercropping system at a spacing of 4 × 6 m in Hetian old oasis, south Xinjiang province, northwest China. Roots were sampled by auger in the Persian walnut tree/wheat intercropping system and in the sole wheat and sole walnut systems, down to a depth of 1 m in the soil profile. The results show that the roots of the trees spread under the crop and that the roots of intercropped wheat tended to have a shallower distribution in the soil profile. The roots of both intercropped walnut and wheat had a lower root length density and root diameter and a higher specific root length at all soil depths than those of sole walnut trees and wheat in 2012. Although root competition belowground led to decreases in yield and biomass of both crops, intercropping of Persian walnut and wheat improved the utilization of plant growth resources (LER > 1) as compared with sole crops. Tree height, diameter at breast height and mean radius of crown of intercropped trees in both intercropping years had lower values when compared with the monoculture. We conclude that interspecific interactions occurred largely as below-ground competition between the species investigated. Competition for soil resources was the primary limiting factor for wheat productivity. Further research is needed to examine the dynamic processes of species interactions in intercropping systems with trees of increasing age.
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DOI：
10.1201/9781420049466.ch4
发表时间：
1999-12
期刊：
--
影响因子：
--
作者：
P. Ashton
通讯作者：
P. Ashton
影响因子：
2.2
作者：
V. Jamaludheen;B. Mohan Kumar;P. Wahid;N. Kamalam
通讯作者：
V. Jamaludheen;B. Mohan Kumar;P. Wahid;N. Kamalam
苹果树和农作物之间的竞争在中国黄土高原上的农林业系统中。
影响因子：
3.7
作者：
Gao L;Xu H;Bi H;Xi W;Bao B;Wang X;Bi C;Chang Y
通讯作者：
Chang Y
影响因子：
2.2
作者：
K. Droppelmann;J. Ephrath;P. Berliner
通讯作者：
K. Droppelmann;J. Ephrath;P. Berliner
影响因子：
3
作者：
C. Soderquist
通讯作者：
C. Soderquist