Desertification is a critical environmental
problem in global drylands. In México, livestock
production, subsistence farming, and long periods of drought have led to severe
land degradation in large areas of its drylands. This
has provoked long-term declines in soil carbon stocks and fertility, which are considered
to be key ecosystem services supporting both ecosystem functioning and
sustainable livelihoods in coupled human-ecological systems. The DDP is an integrated framework to explore
simultaneously the environmental, economic and social dimensions of
desertification. We present a case study in the rural community La Amapola
in the Central Plateau of México, where we analyzed the complex interactions and feedbacks between human
activities (livestock production, rain-fed agriculture), topography and the
spatial distribution of soil carbon and fertility by implementing the DDP. We
identified key socioeconomic drivers for goat, corn and bean production; and
using a landscape-scale sampling approach, we examined differences in soil
organic carbon (C), total soil nitrogen (N) and organic matter (SOM) at five
sites in three dominant land use types (rangeland, crop fields, oak-pine
forest). The long-term grazing and cropping history is reflected in greatly
reduced soil C and N stocks in rangelands and agricultural fields, which are over
60 % lower than in forests (P<0.0001). Crop fields in the valley bottom have
greater C, N and SOM stocks than uphill rangelands (P<0.001). However,
overriding differences in soil fertility among croplands are associated with
land tenure policies, which allow only some households access to government
subsidy programs (use of tractors and irrigation). Hence, certain management
practices and preferences by some households to grow monocultures impacts soil
C stocks and fertility. We propose options for adaptive carbon management as a long-term
strategy for the restoration of key supporting ecosystem services in La Amapola.