Global depth distribution of belowground net primary productivity and its drivers

发布日期:2023年8月1日 Author:Zhongkui Luo Core journals:GLOBAL CHANGE BIOLOGY

Abstract

Aim

This study aimed to infer the allocation of belowground net primary productivity (BNPP) to sequential soil depths down to 2m across the globe at a 1km resolution and assess underlying environmental drivers.

Location
Global.

Time Period

Contemporary (1932–2017).

Major Taxa Studied
Terrestrial plants.

Methods

Global datasets including field net primary production (NPP, i.e., the difference between plant assimilated and respired carbon) from 725 soil profiles, root biomass and its depth distribution from 559 soil profiles were compiled and used to infer the depth distribution of BNPP across the globe and digitally map depth-resolved BNPP globally at 1km resolution. Drivers of the depth distribution of BNPP were evaluated using machine learning-based models.

Results

Global average BNPP allocated to the 0–20cm soil layer is estimated to be 1.1Mg C ha1yr1, accounting for ~60% of total BNPP. Across the globe, the depth distribution of BNPP varies largely, and more BNPP is allocated to deeper layers in hotter and drier regions. Edaphic, climatic and topographic properties (in order of importance) explain >80% of such variability; and the direction and magnitude of the influence of individual properties are soil depth- and biome-dependent.

Main Conclusions

The findings suggest that mean annual temperature and precipitation are the two most important factors regulating BNPP across the globe. Soil properties such as soil actual evaporation and total nitrogen also play a vital role in regulating the depth distribution of BNPP. The maps of BNPP provide global benchmarks of depth-resolved BNPP for the prediction of whole-profile soil carbon dynamics across biomes.

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