白菜与甜菜间作的生长与资源利用效果

通过设置不同的白菜与甜菜间作密度,监测了复合群体的叶面积指数、漏光率以及各作物产量,研究复合群体的生长动态,光资源分布以及产量产值效应。结果表明:在间作群体中,白菜依其速生优势而表现偏利效应,间作甜菜前期受白菜遮蔽胁迫,其生育期叶面积指数始终低于单作;白菜收获后甜菜通过叶层自动空间散布提高光能截获率,促进了后期光合补偿性生产;白菜2行∶甜菜1行间作(BT1)处理,白菜的实际产量比"预期"产量极显著增高26.7个百分点,甜菜比"预期"产量增高34.0个百分点;白菜2行∶甜菜2行间作(BT2)处理,白菜、甜菜的实际产量比"预期"产量分别极显著增高59.3、53.0个百分点;BT1、BT2间作群体较白菜单作经济效益分别提高10.2、23.7个百分点,较甜菜单作经济效益分别提高91.5、115.1个百分点。分析表明,间作种植显著提高了地气资源的利用效率,BT1间作LER为1.29;BT2间作LER高达1.56。

Study on Growth and Resource Usage in an Intercrop of Chinese Cabbage and Beets

Through setting up different intercropping density of Chinese cabbage and beets,monitor the leaf area index of composite group,light transmittance,and yield of each crop.The results showed that intercrop Chinese cabbage display slant the effect lied to its advantage of fast-growing,intercrop beets suffer the stress from close cover of cabbage,and its leaf area index were always lower than sole crop beets in the growth period;after cabbage harvest intercrop beets improved the light intercepting rate depended on the canopy space automatic spread,so as to promote photosynthetic compensatory production in later growth period;in 2 line Chinese cabbage∶1 line beets intercrop(BT1),the yield of intercrop Chinese cabbage significantly advantage was 26.7% for ’expect’ yield,the yield of intercrop beets significantly advantage was 34.0% for ’expect’ yield;in 2 line Chinese cabbage∶2 line beets intercrop(BT2),the yield of intercrop Chinese cabbage and beets significantly advantage were 59.3% and 53.0% for ’expect’ yield.The economic benefits of BT1 and BT2 intercropping group were increased by 10.2% and 23.7% than sole crop Chinese cabbage,by 91.5% and 115.1% than sole crop beets.Analysis showed that intercropping improved the using efficiency of soil and climate resource,the LER of BT1 intercrop was 1.29,and of BT2 was 1.56.