文献类型：期刊文献

英文题名：Effect of nitrate supply on the facilitation between two salt-marsh plants (Suaeda salsa and Scirpus planiculmis)

作者：Ma, Hua[1,2] Cui, Li-Juan[1,2,3] Pan, Xu[1,2,3] Li, Wei[1,2,3] Ning, Yu[1,2] Zhou, Jian[4]

第一作者：马骅;Ma, Hua

通信作者：Cui, LJ[1];Cui, LJ[2];Cui, LJ[3]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[3]Beijing Hanshiqiao Natl Wetland Ecosyst Res Stn, Beijing 101309, Peoples R China;[4]Beijing Forestry Univ, Sch Nat Conservat, Beijing 100083, Peoples R China

年份：2020

卷号：13

期号：2

起止页码：204-212

外文期刊名：JOURNAL OF PLANT ECOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000544726900010)】；

基金：This research was supported by the National Key R&D Program of China (2017YFC0506200).

语种：英文

外文关键词：nitrate supply; salinity gradient; salt-marsh plants; facilitation; stress-gradient hypothesis

摘要：Aims In estuarine salt-marshes, nitrate supply and soil salinity, which are known as two main environmental drivers, simultaneously affect the interspecific interactions between plant species. However, to date, their interactive effects on interspecific interactions have not been closely examined for salt-marsh plant species. Methods Juvenile plants of Suaeda salsa L. (Chenopodiaceae) and Scirpus planiculmis Fr. (Cyperaceae) were grown in rinsed river sand to conduct a greenhouse experiment with three treatment categories: interspecific interaction (mixed culture or monoculture), three salinity levels (1, 50 and 100 mmol L-1) and three nitrate levels (0.5, 5 and 10 mmol L-1). First, height and biomass of all plants were measured. Then, the growth data, relative interaction index and competitive important index of the two species were analyzed. Important Findings The interspecific interactions between S. salsa and S. planiculmis were facilitation across the salinity gradients. The promotion of S. salsa growth with high nitrate supply did not enhance the facilitative effect of the species, especially at low salinity. However, high nitrate supply significantly shifted the interspecific interactions of S. planiculmis from facilitation to competition at high salinity. Our results suggest that excessive nitrate application changes the prediction of the stress-gradient hypothesis along a salinity gradient, leading to collapse of the two species coexistence in the salt-marshes. These findings make a contribution to the understanding of how S. salsa and S. planiculmis, as well as salt-marsh communities, respond to the human modification of estuarine nutritional levels.