Wheat/maize or wheat/soybean strip intercropping I. Yield advantage and interspecific interactions on nutrients
Wheat/maize or wheat/soybean strip intercropping I. Yield advantage and interspecific interactions on nutrients
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DOI：
10.1016/s0378-4290(01)00156-3
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发表时间：
2001-06-28
影响因子：
5.8
通讯作者：
Rengel, Z
中科院分区：
文献类型：
--
作者：
Li, L;Sun, JH;Rengel, Z
在甘肃省的两个田间试验中，研究了间作系统的产量优势，并比较了小麦、玉米和大豆对N、P、K的吸收。在白云试验点，田间试验比较了两种磷水平(0和53 kg P ha(-1))、两种小麦和玉米种植密度以及三种作物处理(小麦/玉米间作、单作小麦和单作玉米)。京潭麦豆间作试验设计相似，只是施肥量为0和33 kg P ha(-1)，不进行密度处理。除玉米对钾的吸收外，小麦、玉米和大豆间作的产量和养分吸收均显著高于小麦、玉米和大豆。间作在产量(小麦与玉米间作40%~70%，小麦与大豆间作28%~30%)和小麦吸收养分方面的优势是边行和内行效应共同作用的结果。边行效应和内行效应对生物量增加的相对贡献率分别为三分之二和三分之一。氮、磷和钾的积累也有类似的趋势。在玉米或大豆出苗到小麦收获的80天左右的共生长期内，间作小麦的产量和养分吸收显著增加，而玉米或大豆与小麦间作的产量和养分吸收显著下降。小麦相对于玉米(A(Wm)的0.26-1.63)或大豆(A(Ws)的0.35-0.95)的聚集力表明，小麦的竞争能力强于玉米或大豆。小麦与玉米的营养竞争比为1.09~7.54，小麦与大豆的营养竞争比为1.2~8.3，表明小麦比大豆和玉米具有更强的养分获取能力。间作与单作的氮、钾吸收总量的比较表明，在共生长过程中，种间促进了养分的吸收。(C)2001 Elsevier Science B.V.保留所有权利。
This study investigated yield advantage of intercropping systems and compared N, P and K uptake by wheat, maize, and soybean in two field experiments in Gansu province. At Baiyun site the field experiment compared two P levels (0 and 53 kg P ha(-1)), two planting densities for wheat and maize, and three cropping treatments (wheat/maize intercropping, sole wheat and sole maize). The design for the wheat/soybean intercropping experiment at Jingtan site was similar, except that fertilization rates were 0 and 33 kg P ha(-1) without plant density treatment. Yield and nutrient acquisitions by intercropped wheat, maize and soybean were all significantly greater than for sole wheat, maize and soybean with the exception of K acquisition by maize. Intercropping advantages in yield (40-70% for wheat intercropped with maize and 28-30% for wheat intercropped with soybean) and in nutrient acquisition by wheat resulted from both the border- and inner-row effects. The relative contribution to increasing biomass was two-thirds from the border-row effect and one-third from the inner-row effect. Similar trends were noted for N, P and K accumulation. During the co-growth period, lasting for about 80 days from maize or soybean emergence to wheat harvesting, yield and nutrient acquisition by intercropped wheat increased significantly while those by maize or soybean intercropped with wheat decreased significantly. Aggressivities of wheat relative to either maize (0.26-1.63 of A(wm)) or soybean (0.35-0.95 of A(ws)) revealed the greater competitive ability of wheat than either maize or soybean. The nutrient competitive ratio, 1.09-7.54 for wheat relative to maize and 1.2-8.3 for wheat relative to soybean, showed that wheat had greater capability to acquire nutrients compared to soybean and maize. Comparison of overall N and K acquisition by intercropping with weighted means of those of sole cropping revealed interspecific facilitation in nutrient acquisition during co-growth. (C) 2001 Elsevier Science B.V. All rights reserved.