施N量与西藏野生垂穗披碱草种子产量及产量因子的相关性分析

Correlation analysis of nitrogen application rate and Tibetan wild Elymus nutans seed yield and its yield factors

【目的】探讨施N量对西藏野生垂穗披碱草种子产量及产量因子的影响。【方法】采用随机区组设计,分别设施N量为0(CK),50,90,130,170,210,250,290和330 kg/hm2共9个处理,在不同时期观察并记录各处理垂穗披碱草的每m2生植枝数(X1)、每生植枝小穗数(X2)、每小穗小花数(X3)、每小穗种子粒数(X4)、种子千粒重(X5)和每公顷种子产量(Z),分析施N量与种子产量及产量因子间的相关性。【结果】施N量与西藏野生垂穗披碱草的种子产量、每m2生殖枝数和种子千粒重间极显著相关;每m2生殖枝数和种子千粒重均与种子产量间极显著相关,每m2生殖枝数与种子千粒重极显著相关,每小穗种子粒数与种子产量、每m2生殖枝数、种子千粒重间均达显著相关。【结论】施氮能够显著促进生殖枝和每小穗种子粒数的形成,千粒重也随之增加,但对每生殖枝小穗数、每小穗小花数无显著影响;施氮还可提高西藏野生垂穗披碱草的实际种子产量,其中以施N 250 kg/hm2的效果最好,产量可达2 016.5 kg/hm2。

[Objective] The study discussed the correlation of Nitrogen application rate and Tibetan wild Elyrnus nutans seed yield and its yield factors. [Method] The field experiment was arranged in a randomized complete block design. The Elymus was grown at nine rates of N fertilization （0,50,90,130,170,210, 250,290 or 330 kg/hm^2）. In each plot,the number of fertile tillers per square meter（X1）,spikelets per fertile tiller（X2）,florets per spikelet（X3）and fertile florets per spikelet（X4 ）were counted at different growth stages,and the thousand-seed weight（Xs）and seed yield （Z） were noted. Correlations of nitrogens application rate,seed yield and its yield factor were analyzed. [Result] Nitrogen application rate and seed yield, and fertile tiller per m^2 ,and thousand-seed weight were very significantly correlated. Seed yield and Fertile tiller per m^2 ,and thousand-seed weight were very significantly positive-correlated. Fertile tiller per m^2 and thousand-seed weight achieved a very significant level. Fertile florets per spikelet and seed yield,and fertile tiller per m^2 ,and thousand-seed weight reached significant levels. [Conclusion] Nitrogen could contribute significantly to the promotion of fertile tiller and fertile florets. With the increase of N thousand-seed weight also increased, but there was no significant effect on Spikelets per fertile tiller and florets per spikelet. Nitrogen could increase the actual seed yield of Tibetan wild Elymus nutans. The result indicated that N 250 kg/hm^2 produced the optimal effect,producing 2 016.5 kg/hm^2 seed yield.