Ding Song-Shuang, Su Pei-Xi
Linze Inland River Basin Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
Ying Yong Sheng Tai Xue Bao. 2009 May;20(5):1066-71.
Farmland shelterbelt is a main component of oasis agro-ecosystem in the Hexi corridor of Gansu Province, which plays an important role in maintaining local agricultural production and ecological balance. This paper studied the photosynthetic characteristics of maize at its grain-filling stage and the grain yield of maize under the protection of the shelterbelt. The results showed that at the same distances east and west of the shelterbelt, maize plants at the east side always intercepted more photosynthetic active radiation (PAR) than those at the west side. Within 20 m from the west side of the shelterbelt, the net photosynthetic rate (P(n)) of maize plants was lower because of the serious shading by trees; and within 15 m from the west side, the P(n) was lower than that from the east side. The grain yield of maize was decreased within 10 m from the east and 15-20 m from the west side, but increased or not affected in other locations.
农田防护林是甘肃省河西走廊绿洲农业生态系统的主要组成部分，在维持当地农业生产和生态平衡方面发挥着重要作用。本文研究了玉米灌浆期的光合特性以及在防护林保护下玉米的籽粒产量。结果表明，在防护林东西两侧相同距离处，东侧玉米植株截获的光合有效辐射（PAR）总是比西侧多。在距防护林西侧20米范围内，由于树木遮荫严重，玉米植株的净光合速率（P(n)）较低；在距西侧15米范围内，P(n)低于东侧。在距东侧10米和西侧15 - 20米范围内玉米籽粒产量下降，但在其他位置产量增加或不受影响。
