Abstract
Warming of the climate system is unequivocal, that is, stronger warming during night-time than during daytime. Here we focus on how soil nematodes respond to the current asymmetric warming. A field infrared heating experiment was performed in the western of the Songnen Plain, Northeast China. Three warming modes, i.e. daytime warming, night-time warming and diurnal warming, were taken to perform the asymmetric warming condition. Our results showed that the daytime and diurnal warming treatment significantly decreased soil nematodes density, and night-time warming treatment marginally affected the density. The response of bacterivorous nematode and fungivorous nematode to experimental warming showed the same trend with the total density. Redundancy analysis revealed an opposite effect of soil moisture and soil temperature, and the most important of soil moisture and temperature in night-time among the measured environment factors, affecting soil nematode community. Our findings suggested that daily minimum temperature and warming induced drying are most important factors affecting soil nematode community under the current global asymmetric warming.
Highlights
Warming of the global land surface, due to the rapid increasing of greenhouse gases, is an indisputable fact
We examine the effect of asymmetric warming on soil nematodes in field, using infrared heaters to simulate climate warming
The maximum temperature increase and the maximum moisture decrease were observed in diurnal warming treatment (24 hW), with an average increase of 1.3 °C, 1.9 °C and 1.5 °C for average daytime temperature (Tday), average night-time temperature (Tnight) and average diurnal temperature (Tdiurnal), respectively, and a decrease of 14.8% of soil moisture (Table 1)
Summary
Warming of the global land surface, due to the rapid increasing of greenhouse gases, is an indisputable fact. A faster and higher warming during the night than the day, i.e. asymmetric warming, was recognized by long-term meteorological observations and recent climate change scenarios predictions[1,2,3]. This asymmetric warming is expected to affect the ecological processes of aboveground ecosystem, e.g. plants and their insect herbivores and terrestrial ecosystems carbon budgets[4, 5]. We hypothesized that soil nematode would response differently to asymmetric warming and drying caused by warming could be an important factor affecting soil nematode community as the semiarid condition of the study site
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