Nitrogen absorption by field-grown tea plants (Camellia sinensis) in winter dormancy and utilization in spring shoots

文献类型： 外文期刊

第一作者： Ma, Lifeng

作者： Ma, Lifeng;Shi, Yuanzhi;Ruan, Jianyun

作者机构：

关键词： Low temperature; N uptake; Root growth; Soil growing degree days; Young spring shoots; Winter dormancy

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2019 年 442 卷 1-2 期

页码：

收录情况： SCI

摘要： Aims The information of nitrogen uptake by subtropical, ever-green broad-leaf plants at cold temperatures of winter is very limited. The present field experiment was conducted to investigate whether N-15 is taken up by tea (Camellia sinensis L.) plants in winter dormancy in the absence of active shoot growth and utilization in young spring shoots. Methods We applied N-15-labeled urea to soil at five different times i.e. mid-January, early February, mid-February, and early and mid-March. N-15 abundance was determined in fibrous roots, twigs and mature leaves after 3, 7 and 15 days after application and in young shoots the following spring. Results N-15 was taken up by fibrous roots and transported to above-ground tissues within 3 days after application under low winter temperatures. Earlier application significantly increased nitrogen derived from N-15-urea (N-dff) and N-15 amount in young spring shoots. N-dff values and N-15 amount in young spring shoots were described well by quadratic or linear regressions against soil growing degree days (GDD, T >= 8 degrees C, depth 20 cm) between N-15 application and harvesting dates (R-2 = 0.58-0.90, p < 0.001). Conclusions Nitrogen was absorbed and translocated in dormant tea plants in the absence of active root and shoot growth throughout the late winter until early spring. Absorbed N was stored and remobilized to support shoot growth the following spring. Soil GDD between N application and harvesting could predict N-dff and N-15 amount in young spring shoots.

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