Short term effects on ecosystem CO2 exchange in a semi-arid grassland agro-pastoral ecotone, following differing levels of nitrogen application

doi:10.11686/cyxb2018409

Abstract

Abstract: This study investigated the short-term effects of different nitrogen (N) application rates in a semi-arid grassland ecosystem in an agro-pastoral ecotone in Youyu County, Shanxi Province, China. A randomized complete block experiment was set up with 8 nitrogen levels (0, 1, 2, 4, 8, 16, 24, and 32 g N·m^-2, denoted N₀, N₁, N₂, N₄, N₈, N₁₆, N₂₄, N₃₂, respectively), and 6 replicates (48 plots in total). Ecosystem net CO₂ exchange (NEE) and ecosystem respiration (ER) under the different treatments were monitored using the static chamber method, with a fixed base for the portable chamber located in each plot before the start of the growing season, and chamber dimensions 50 cm×50 cm×50 cm. Gross ecosystem CO₂ capture was calculated from those primary data by difference, and was taken as gross ecosystem productivity (GEP). Nine measurements were undertaken at approximately two weekly intervals between June and September. Over this period, short-term N addition (except N₃₂, which had a detrimental effect) significantly increased the net carbon uptake, with peak response seen in N₁₆ and N₂₄ treatments. The responses of ER and GEP to different N addition were more sensitive than NEE. There was a significant positive correlation between 10 cm soil temperature and ER (R²=0.319, P<0.0001), while the soil moisture for the upper 10 cm was significantly positively correlated with NEE (R²=0.420, P<0.0001) and was significantly negatively correlated with GEP (R²=0.202, P=0.0004). Therefore, short-term nitrogen addition increased the net carbon uptake of this semi-arid in the agro-pastoral ecotone, grassland ecosystem. Our study provides some reference data for grassland ecosystem carbon source/sink relationships in this region.

Key words: nitrogen addition levels, agro-pastoral ecotone, semi-arid grassland, ecosystem CO₂ exchange

DONG Xiao-xiao, BO Yuan-chao, SUN Jian-ping, ZHANG Xiao-lin, WANG Chang-hui, DONG Kuan-hu. Short term effects on ecosystem CO₂ exchange in a semi-arid grassland agro-pastoral ecotone, following differing levels of nitrogen application[J]. Acta Prataculturae Sinica, 2019, 28(5): 163-170.

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Short term effects on ecosystem CO₂ exchange in a semi-arid grassland agro-pastoral ecotone, following differing levels of nitrogen application

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