Hanqin Tian

1 month ago | nature.com | Xiangcheng Zhu |Feng Zhou |Peter Smith |Hanqin Tian |Jianwen Zou |Shuwei Liu | +3 more

AbstractAgricultural soils contribute ~52% of global anthropogenic nitrous oxide (N2O) emissions, predominantly from nitrogen (N) fertilizer use. Global N2O emission factors (EFs), estimated using IPCC Tier 1 methodologies, largely rely on short-term field measurements that ignore legacy effects of historic N fertilization. Here we show, through data synthesis and experiments, that EFs increase over time.

Sep 17, 2024 | nature.com | Chao Wang |Baojing Gu |Feng Zhou |Deli Chen |Hanqin Tian |Philippe Ciais | +1 more

AbstractMaize and wheat are two major staple foods that collectively contribute two-thirds of the world’s grain supply. The extensive use of nitrogen (N) fertilizers during the cultivation of both crops leads to significant losses of reactive nitrogen (Nr) into the environment. Here, using machine learning algorithms, we generate high-resolution maps of crop-specific soil Nr losses based on global field measurements.

Aug 27, 2024 | goodgoodgood.co | Hanqin Tian

Food’s role in climate change has emerged as one of the defining challenges of our time. The journey of a steak, fruit or salad from the vast expanses of agricultural lands to the plates on our tables leaves a significant footprint on the environment. At the heart of this challenge is the prodigious use of fertilizers and a growing global population’s increasing demand for meat.

Aug 19, 2024 | onlinelibrary.wiley.com | Linchao Li |Chaoqun Lu |Wilfried Winiwarter |Hanqin Tian

1 INTRODUCTION Nitrous oxide (N2O) is one of the powerful and long-lived greenhouse gases (GHG). Its atmospheric concentration has increased by approximately 24.8% from pre-industrial levels to 2023 (Lan et al., 2024). Among all known N2O surface emission sources, agricultural soil accounts for around 50% of the anthropogenic N2O emissions (Shcherbak et al., 2014; Tian et al., 2020).

Jul 24, 2024 | nature.com | Hanqin Tian |Hong Liao |Naiqing Pan |Shufen Pan |Akihiko Ito |Atul Jain | +5 more

AbstractAnthropogenic activities have substantially enhanced the loadings of reactive nitrogen (Nr) in the Earth system since pre-industrial times1,2, contributing to widespread eutrophication and air pollution3,4,5,6. Increased Nr can also influence global climate through a variety of effects on atmospheric and land processes but the cumulative net climate effect is yet to be unravelled.