黔中玉米耕地土壤杂草种子库季节动态

Seasonal Dynamics on Soil Seedbank of Weed in Corn Cultivated Land of Qian-zhong Area

对黔中玉米耕地土壤进行种子萌发试验,结果表明:玉米地杂草种子库共有44个物种出现,隶属16科40属。4个季节单位面积的种子萌发量Ⅰ季度8 609粒/m2>Ⅲ季度8 045粒/m2>Ⅱ季度6 491粒/m2>Ⅳ季度2 698粒/m2。狗尾草和水田碎米荠为上半年库中优势物种,下半年优势物种则为波斯婆婆纳。整体上随土壤层次的增加种子库存量相对减少,冬季活力种子萌发量最少;就物种多样性而言,种子库Shannon-W iener指数和Simpson指数均表现为Ⅱ>Ⅰ>Ⅲ>Ⅳ。

A sprouting experiment was carried on weed seedbank of the corn cultivated land in Qian-zhong area, the results indicate： the weed seedbank of corn farmland altogether has 44 species appearances, subordinating 16 branches,40 genus. Comparing the seed sprouts quantity of unit areas in four seasons, the result shows that Ⅰ quarter 8 609 grain of/m^2 〉 Ⅲ quarter 8 045 grain of/m^2 〉 Ⅱ quarter 6 491 grain of/m^2 〉 Ⅳ quarter 2 698 grain of/m^2. The two plants of Setaria viridis and Cardamine lyrata in the first half year and the plant of Veronica persica in the second half year are the dominant species. In the whole relatively reduces along with the soil level increase seed reserve, the winter vigor seed sprouts the quantity are least in four seasons. The species diversity says that the index of Shannon-Wiener and Simpson performance is Ⅱ〉Ⅰ〉Ⅲ〉Ⅳ.