摘要
对农桐间作（以桐为主间作型）的养分循环规律进行了研究。结果表明，泡桐各器官营养元素的含量随季节而变化。对营养元素的年吸收量为４７１．９５９５ｋｇ／ｈｍ￣２，其中氮１５５．１４２９ｋｇ／ｈｍ￣２，磷８０．０８２１ｋｇ／ｈｍ￣２，钾８７．０３９４ｋｇ／ｈｍ￣２，钙１１９．４６０３ｋｇ／ｈｍ￣２，镁３０．２３４８ｋｇ／ｈｍ￣２。营养元素的年归还量为３３１．６１５５ｋｇ／ｈｍ￣２，其中氮１０２．５７２１ｋｇ／ｈｍ￣２，磷４３．２９２２ｋｇ／ｈｍ￣２．钾６３．６４９７ｋｇ／ｈｍ￣２，钙９７．３５８６ｋｇ／ｈｍ￣２，镁２４．７４２９ｋｇ／ｈｍ￣２。营养元素的循环率为７０、２６％，其中氮６６．１１％，磷５４．０６％，钾７３．１３％，钙８１．５０％，镁８１．８４％。
Nutrient cycling rule in paulownia and crop in-tercropping system,in which paulownia was mainly consid-ered,was studied.TheresultS showed that the contents of nu-trient elernents in different organ;of Paulownia varied with seasons;the annual total uptake of nutrient elerments was 471.96kg/hm￣2,composed of N 155.14kg/hm￣2.P 80.08kg/hm￣2.K87.04kg/hm￣2.Ca 119.46kg/hm￣2 and Mg 30.23kg/hm￣2, the annual return amount of nutrient elements was 331.62kg/hm￣2,composed of N 102.57kg/hm￣2, P 43.29kg/hm￣2,K 63.65kg/hm￣2,Ca 97.36kg/hm￣2 and Mg 24.74kg/hm￣2. The circulation rate of nutrient elements was 70.26%,com-Dosed of N 66.11%,P 54.06%,K 73.13%,Ca 81.50%and Mg81.81%.
出处
《农村生态环境》
CSCD
1994年第4期7-11,共5页
Rural Eco-Environment
关键词
农桐间作
养分循环
循环率
泡桐属
Paulownia, Paulownia and crop intercrop-ping,nutrient cycling,circulation rate
