刈割冬牧70黑麦地上生物量动态与草群再生效应的研究

通过刈割冬牧70黑麦研究一，二茬草地上生物量动态特征及草群的再生效应，结果表明：从返青至初夏（6月7日）的生长期内，冬牧70黑麦可收获两茬草，地上最高总生物量可达1004．20g/m2，表明其具有强的光合生产效率，通过一，二茬草生产性能比较可以看出，在最高总生物量中，二茬草占57．11％，生长天数占总生长天数的42．06％；一茬草鲜干比相对较大，茎叶比则相对较低，说明一茎草更适合用作青饲或制备青绿饮食品；二茬草则更利于制备干草饲用或纤维食品，AGR与RGR的比较可进一步证明一茬草后期的管理对草群总生物量的形成具有重要的作用，本研究为最大限度发挥冬牧70黑麦生产性能及实施高效生态农业工程提供理论依据。

STUDY ON THE GROWTH DYNAMICS OF ABOVEGROUND BIOMASS AND REPRODUCTIVE EFFECTS OF POPULATION OF SECALE CARELE L.BY MOVWING

It dealt with dynamics of grassland aboveground biomass and reproductive effects of population of Secale carele L. of the first and the second crop by mowing a time before summer. The results showed that Secale carele L . can be croped two crops in growth date from turngreen to early summer (June 7).The highest total aboveground biomass was 1004.20 g/m 2 .There was an indication that the herb had high efficiency of photosynthesis. Through contrast of productive characteristic of the first and second crop, there were results that the second crop was 57.11% in the highest total aboveground biomass and growth date of the crop was 42.06% in total growth date. To the first crop the ratio of fresh herb and dry herb was relatively high and the ratio of stem to leaf was relatively low. The results showed clearly that the first crop was more suited for fresh fodder or green drink and food,and the second crop was more suited for dry fodder or natural fiber food. Through comparative study of AGR and RGR, it was further testified that later management of the first crop had an important effect on formation of total aboveground biomass. The study provided a scientific basis for applying ecological engineering of efficient agriculture to developing productive characteristic of Secale carele L. to a maximum.