Effects of fertilization and mixed crops on carbon and nitrogen allocation of the different plant organs on oat cultivation grassland on alpine area
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DOI:10.7606/j.issn.1000-7601.2019.04.13
Key Words: alpine area  oats artificial grassland  fertilization  mixture seeding  plant organ  carbon allocation  nitrogen allocation
Author NameAffiliation
LIU Wen-Hui Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, Qinghai Academy of Animal Science and Veterinary, Xining, Qinghai 810016, China 
WEI Xiao-Xing Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, Qinghai Academy of Animal Science and Veterinary, Xining, Qinghai 810016, China 
LIU Fang National Animal Husbanclry Service, Beijing, 100126 
QIN Yan Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, Qinghai Academy of Animal Science and Veterinary, Xining, Qinghai 810016, China 
ZHANG Yong-Chao Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau, Qinghai Academy of Animal Science and Veterinary, Xining, Qinghai 810016, China 
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Abstract:
      To understand the effect of oat variety, fertilizer, and legume mixture on the carbon (C) and nitrogen (N) stock and allocation of different plant organs on oat cultivation grassland, we carried out a experiment including four oats varieties and four levels of nutrient addition (B1: No addition CK0; B2: urea 75 kg·hm-2+ diammonium phosphate 150 kg·hm-2,IM; B3: organic fertilizer 1 500 kg·hm-2,OM; B4: urea 75 kg·hm-2+ diammonium phosphate 150 kg·hm-2+ organic fertilizer 1 500 kg·hm-2 IM+OM) and four legume mixture levels (C1:0 kg·hm-2;C2:45 kg·hm-2;C3:60 kg·hm-2;C4:75 kg·hm-2) to analyze the effect of different agronomy procedure and C and N allocation pattern and the relationship between the C and N stock below and above ground and the growth. As the results shown, three kinds of agronomy procedures significantly affected C and N allocation. The variety played an important role in legume plant stem and root carbon stock and allocation, mixture affected the legume stem, leaf and root nitrogen allocation. Under the agronomy procedure (Avena sativa L.cv. Qingyan No.1 monoculture,urea 37.5 kg·hm-2 and diammonium phosphate 75 kg·hm-2 and organic fertilizer 750 kg·hm-2), the carbon and nitrogen stock in the stem, leaf, spike and root of the oat were highest compared with other agronomy procedures (carbon stock, stem 40.21%, leaf 15.48%, spike 23.20% and root 9.89%; nitrogen stock, stem 20.70%, leaf 20.79%, spike 32.09% and root 5.19%). When mixture with Avena sativa L. cv. Qinghai No.444, the cultivation of Vicia sativa L. under 75 kg·hm-2 without fertilization got a highest carbon and nitrogen stock and allocation in stem, leaf and root (carbon stock, stem 11.27%, leaf 13.57% and root 2.27%; nitrogen stock, stem 13.03%, leaf 32.18% and root 0.95%). The allocation pattern of the oat cultivation grassland was stem(44.39%)> leaf(23.99%)> spike(20.38%)> root(11.24%) for C and leaf(42.14)> stem(26.77%)> spike(25.96%)> root(5.13%) for N. In the oat and legume mixture grassland, the stem and spike of oats and the legume leaf were the main carbon and nitrogen stock organs.
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