The study reveals the pattern and mechanism of the response of bio-nitrogen fixation to nutrient input

Reporters from the Chinese Academy of Sciences South China Botanical Garden was informed that the park's ecological center Zheng Mianhai, under the guidance of Mo Jiangming researchers, revealed the terrestrial ecosystem bio-nitrogen fixation response pattern and mechanism to nutrient input. The study was published recently in the journal Global Change Biology, a leading journal in the field of global change.
nitrogen fixation is one of the important sources of nitrogen in terrestrial ecosystems, and its activity affects the nutrient cycle and net primary productivity of ecosystems. Although most controlled experimental studies have shown that nutrients are important factors affecting bio-nitrogen fixation, on a global scale, the understanding of nutrient-regulated terrestrial ecosystem bio-nitrogen fixation and its drivers is still weak.
Researchers collect and integrate analysis of different natural ecosystems around the world (tropical/subtropical forests, tempered forests, northern forests, grasslands and tundra), different substations (soil, apoptosis, moss, lichens, leaves and root tumors) and different nitrogen fixation types (free The response patterns of nitrogen fixation and symbient nitrogen fixation to nutrient inputs (nitrogen, phosphorus and trace elements) were analyzed, and the effects of nutrient addition measures (nutrient addition rate, duration and total input) and environmental factors (temperature, rainfall and nitrogen sectoring) on these response patterns were analyzed.
studies have shown that nitrogen addition inhibits ecosystem bio-nitrogen fixation (?19%), trace nutrient addition promotes ecosystem bio-nitrogen fixation (-30.4%), and the effects of phosphorus addition on bio-nitrogen fixation depend on ecosystem, substation and nitrogen fixation type. The study further found that the response of mid- to high-latitude ecosystem bio-nitrogen fixation to nutrient inputs (32.9?61.3%) was more sensitive than that of low-latitude ecosystems (8.5?36.9%), and that the response of mid- to high-latitude ecosystem bio-nitrogen fixation decreased as latitude decreased.
In addition, the study also revealed that nutrient addition measures did not affect the response of bio-nitrogen fixation, but environmental factors significantly affected the response of bio-nitrogen fixation to nutrient input, i.e., with the increase of temperature, rainfall and atmospheric nitrogen sethering rate, the response of bio-nitrogen fixation to nutrient input in mid- and high-latitude ecosystems (low temperature, low rainfall and low nitrogen sethering areas) decreased.according to
, the study reveals the response pattern of natural terrestrial ecosystem bio-nitrogen fixation to nutrient input and the regulatory mechanism of environmental factors to bio-nitrogen fixation, suggesting that some future global changes (global warming, increased local precipitation and increased nitrogen sectoring) may reduce the limits of nutrients on bio-nitrogen fixation in mid- to high-latitude ecosystems.