Chinese Journal of Plant Ecology >
Responses of plant phenology to warming and nitrogen addition under different precipitation conditions in a desert steppe of Nei Mongol, China
- Key Laboratory of Grassland Resources of the Ministry of Education, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, China
Received date: 2021-07-26
Accepted date: 2021-09-26
Online published: 2021-12-16
Supported by
Applied Technology Research and Development Fund of Inner Mongolia(2021GG0088);Inner Mongolia Major Projects and Achievements Transformation Projects(ZDZX2018020);Inner Mongolia Major Projects and Achievements Transformation Projects(2019CG069)
Abstract
Aims Plant phenology is an important indicator of ecosystem response to climate change, and it is also a central parameter for modelling plant productivity and vegetation dynamics. However, it remains unclear whether inner-annual, intra-annual, inter-species or inter-habitat variabilities exist in the response of plant phenology to environmental changes.
Methods Here we investigated the effects of long-term (>10 years) warming and nitrogen (N) addition on plant phenology in a temperate desert steppe. We used the phenological scoring observation method and Richards growth curve fitting method to monitor phenological shifts of three dominant species, Stipa breviflora, Artemisia frigida and Kochia prostrata, in the 11th, 12th and 13th treatment year.
Important findings We found that the flowering time ranged from the 129th to the 145th days of a year for S. breviflora, from the 230th to the 248th days for A. frigida, and from the 194th to the 222th days for K. prostrata. Warming and N addition tended to advance the flowering time of S. breviflora and K. prostrata, but tended to delay the flowering time of A. frigida. The fruiting time ranged from the 134th to the 148th days for S. breviflora, from the 241th to the 260th days for A. frigida, and from the 207th to the 231th days for K. prostrata. Warming and N addition tended to advance the fruiting time of S. breviflora and K. prostrata, but tended to delay that of A. frigida. The reproductive growth period lasted for 12 to 25 days for S. breviflora, 48 to 55 days for A. frigida, and 45 to 77 days for K. prostrata. Warming and N addition shortened the reproductive growth period for S. breviflora, but prolonged that period for A. frigida and K. prostrata.
Key words： desert steppe; plant phenology; warming; nitrogen deposition; precipitation
Cite this article
TIAN Lei, ZHU Yi, LI Xin, HAN Guo-Dong, REN Hai-Yan . Responses of plant phenology to warming and nitrogen addition under different precipitation conditions in a desert steppe of Nei Mongol, China[J]. Chinese Journal of Plant Ecology, 2022 , 46(3) : 290 -299 . DOI: 10.17521/cjpe.2021.0277
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