Effects of long‐term nitrogen addition on water use by Cunninghamia lanceolate in a subtropical plantation

• DOI: 10.1002/ecs2.4033
• Publication Date: 2022-04-16T05:45:40Z
• Authors: Wenfei Liu; Honglang Duan; Fangfang Shen; Yingchun Liao; Qiang Li; Jianping Wu
• Keywords: Cunninghamia; Water Use Efficiency; Water use; Deposition

Abstract The deposition of reactive nitrogen (N) has substantially increased in subtropical regions due to human activities. However, the effects long‐term N addition on water‐use efficiency forests are poorly understood. Here, we conducted an 11‐year experiment a Cunninghamia lanceolate plantation with four N‐addition levels: N0, N1, N2, and N3 (equivalent 0, 6, 12, 24 g m −2 year −1 , respectively). A thermal dissipation probe system was used calculate sap flow, plant biomass carbon assessed by field investigation. whole‐plant water use were estimated. In addition, δ 13 C tree rings indicate intrinsic efficiency. results showed that treatment significantly annual flow velocity, especially summer winter. Annual use, growth, did not differ among treatments, but tended be higher than N0 treatment. Furthermore, significant reduction supported inference could increase use. We conclude high levels (but low levels) C. plantations. Our findings accompanied temperature drought events may negatively affect balance forests.