中国东部假俭草种质资源多样性初步研究（I） ——物候期变异及其规律

对中国东部有代表性的40份假俭草Eremochloa Ophiuroides(Munro)Hack.]种源的物候期进行了观测分析，结果表明：（1）中国东部地区假俭草种质资源的返青期、孕穗初期、盛花期、成熟期、枯萎期、青绿期均存在着不同程度的变异，其中不同种源物候期变异范围大小依次为：孕穗初期（5月29日~9月29日）＞盛花期（8月28日~10月24日）＞成熟期（10月9日~11月20日）＞枯萎期（11月7日~12月1日）＞返青期（4月18日~5月8日）。青绿期的变异范围为189~217d。（2）中国东部地区假俭草种质资源的返青期和孕穗初期随着纬度的增加而日趋提前。（3）中国东部地区假俭草种质资源的返青期、孕穗初期、盛花期、成熟期、枯萎期、青绿期间有一部分存在着显著或极显著的相关性。返青期与孕穗初期、盛花期、枯萎期呈显著的正相关，相关系数分别为0.3557、0.3429、0.3995，盛花期与枯萎期呈显著的正相关，相关系数为0.3526；孕穗初期与盛花期、成熟期呈极显著的正相关，相关系数分别为0.7834、0.4626，盛花期与成熟期呈极显著的正相关，相关系数为0.6592；而返青期与青绿期呈极显著的负相关，相关系数为-0.8019，表明假俭草的返青期愈早，青绿期愈长。

vPreliminary Study on Germplasm Resources Diversity of Eremochloa Ophiuroides(Munro)Hack. In East China I. Variation of Phenological Phase

The phenological phase observation shows that the turning-green stage, the initial stage of booting stage, the blooming stage, the maturation stage, the wilting stage and the blue-green period are different among different accessions of centipedegrass germplasm resources in East China, their variation scopes are from April eighteenth to May eighth for the turning-green stage, from May twenty-ninth to September twenty-ninth for the initial boot stage, from August twenty-eighth to October twenty-fourth for the blooming stage, from October ninth to November twentieth for the maturation stage, from November seventh to December first for the wilting stage, from 189 days to 217 days for the blue-green period, respectively. Regression analysis indicates that the turning-green period and initial stage of booting stage become earlier with the latitude increasing. Correlation analysis indicates there exists obvious or notable correlation among some of six stages at significant levels. The turning-green stage is positively correlated with the initial stage of booting stage, the blooming stage, the wilting stage at very significant levels, and their coefficients of correlation are 0.3557, 0.3429, 0.3995, respectively. The blooming stage is positively correlated with the wilting stage at significant level, and its coefficient of correlation is 0.3526. The initial stage of booting stage is positively correlated with the blooming stage, the maturation stage at very significant levels, and their coefficients of correlation are 0.7834, 0.4626, respectively. The blooming stage is positively correlated with the maturation stage at very significant level, and their coefficient of correlation is 0.6592. The turning-green stage is negatively correlated with the blue-green period at very significant level, and their coefficient of correlation is 0.8019.