不同土壤水分条件下模拟氮沉降对文冠果结实的影响

Effects of simulated nitrogen deposition under different soil moistures on fruiting of Xanthoceras sorbifolia

文章研究了土壤不同水分条件下200、400kg/(株.a),不同氮沉降0、45和135g/(株.a)对文冠果结实(包括果实产量、种子千粒重、种仁含油率、果实纵横径及其比值等)的影响。结果表明:文冠果结实具有明显的变化特征。氮沉降在一定程度上提高了果实产量和果实横径。氮沉降对种子千粒重、种仁含油率的影响与土壤水分条件有关。低水分条件下,前者随着氮沉降的增加而增加,后者变化不明显。高水分条件下,前者变化不明显,后者则升高。2种水分条件下,果实的纵径、纵横径比均随着氮沉降的增加而降低。

In this paper, effects of different soil moisture （200,400 kg· s^-1·a^-1） and nitrogen deposition （0, 45 and 135 g·s^-1·a^-1） on fruiting ofXanthoceras sorbifolia （including such indicators as yield of fruit, grain weight of seed, oil content of nut, longitudinal and Wansversal diameter and its ratio） were studied. The results showed that： fruiting ofXomhoceras sorbifolia was of apparent variation; nitrogen deposition increased yield and transversal diameter of fruit to some extent. The effects of nitrogen deposition on grain weight of seed and oil content of nut were related with soil moisture： under low moisture condition, the grain weight of seed increased with the increment of nitrogen deposition and the oil content of nut changed little; under high moisture condition, the grain weight of seed changed little and the oil content of nut increased. Under two soil moisture conditions, longitudinal diameter and ratio of longitudinal diameter to transversal diameter decreased with the increment of nitrogen deposition.