果林下6种牧草的光响应特性与地上生物量关系的研究

Study on the Relations of Six Forage’s Photo-response Characteristics and Aboveground Biomass under Orchard

在果林下间作菊苣、紫花苜蓿(新疆大叶)、紫花苜蓿(驯鹿)、红三叶、鸭茅、无芒雀麦,对6种牧草的产量和光响应特性进行测定分析,研究不同牧草在果林的生长状况。结果表明:6种牧草产量的高低依次为菊苣>驯鹿苜蓿>新疆大叶>鸭茅>红三叶>无芒雀麦。利用叶子飘新模型,对6种牧草的光响应曲线拟合表明菊苣、紫花苜蓿(新疆大叶)、紫花苜蓿(驯鹿)的光合能力较强,最大净光合速率均大于15μmolCO2/(m2·s)。6种牧草的光补偿点的大小为鸭茅<菊苣<新疆大叶<驯鹿苜蓿<无芒雀麦<红三叶,光饱和点为驯鹿苜蓿>新疆大叶>无芒雀麦>鸭茅>红三叶>菊苣;6种牧草在光量子小于400μmol/(m2·s)时Pn均值与第1茬鲜草产量存在显著相关关系。

Cichorium intybus L.,Medicago sativa L.（Xinjiang big leaf）,Medicago sativa L.（AC Caribou）,Trifolium pratense L.,Dactylis glomerata L and Bromus inermis Leyss.were intercropped in orchard.The yield and photo-response characteristics of six forage were studied to analyze their growth under fruit forest.The result showed that the yield of six forage were in the order ofCichorium intybus L.Medicago sativa L.（AC Caribou）Medicago sativa L.（Xinjiang big leaf）Dactylis glomerata L. Trifolium pratense L. Bromus inermis Leyss.Light response curves in six forage simulated by YE Zi-piao new model showed that the maximum net photosynthetic rate of Cichorium intybus L.,Medicago sativa L.（Xinjiang big leaf）and Medicago sativa L.（AC Caribou）were more than 15 μmol CO2/（m2·s） with higher photosynthetic capability.Light compensation point of six forage varied in the following order：Dactylis glomerata L. Cichorium intybus L.Medicago sativa L.（Xinjiang big leaf）Medicago sativa L.（AC Caribou）Bromus inermis Leyss Trifolium pratense L.,light saturation point of that were in the order ofMedicago sativa L.（AC Caribou） Medicago sativa L.（Xinjiang big leaf）Bromus inermis LeyssDactylis glomerata L. Trifolium pratense L.Cichorium intybus L.;The average Pn of six forage when the light intensity was less than 400 μmol/（m2·s） had significant correlations with the first-cut fresh biomass.