全球农作物生产的耕作方式¶。
免耕（NT）通常被认为是种植作物的一种手段，具有积极的环境外部效应，如增强碳固存、改善土壤质量、减少土壤侵蚀和增加生物多样性。然而，NT系统是否与依靠传统耕作（CT）的系统一样高产是一个有争议的问题，在时间和空间上充满了高度的变异性。在此，我们扩大了现有的数据集，包括最新的田间实验结果，并制作了一个全球数据集，比较了在CT和NT系统下获得的作物产量。除了作物产量，我们的数据集还报告了整个实验年度的作物生长季节、管理方法、土壤特征和关键气候参数等信息。最终的数据集包含了1980年至2017年期间50个国家8种主要主食作物的4403个成对产量观测值。该数据集有助于深入了解解释新技术生产力变化的主要驱动因素以及采用新技术对作物产量的影响。前言 – 床长人工智能教程
Data Citation¶
Su, Y., Gabrielle, B. & Makowski, D. A global dataset for crop production under conventional tillage and no tillage systems. figshare https://doi.org/10.6084/m9.figshare.12155553 (2020). v14
Paper Citation¶
Su, Y., Gabrielle, B. & Makowski, D. A global dataset for crop production under conventional tillage and no tillage systems. Scientific Data 8, 33 (2021).
Earth Engine Snippet¶
var tillage = ee.FeatureCollection("projects/sat-io/open-datasets/global_tillage_production");
print(tillage.size(),'Total observations')
// Get a color from crop types
var cropColor = ee.Dictionary({
'maize': '000000',
'barley.spring': '593704',
'soybean': 'BC80BD',
'wheat.winter': '0565A6',
'cotton': 'E31A1C',
'sorghum': 'FF7F00',
'sunflower': '6A3D9A',
'wheat_spring': '5CA2D1',
});
// List of crop types to add to the map
var crops = ['maize', 'barley.spring', 'soybean', 'wheat.winter', 'cotton', 'sorghum', 'sunflower',
'wheat_spring'];
function addStyle(pt) {
var color = cropColor.get(pt.get('crop'));
return pt.set('styleProperty', ee.Dictionary({'pointSize': 2, 'color': color}));
}
// Make a FeatureCollection out of the crop table
var pp = ee.FeatureCollection(tillage).map(addStyle);
print(pp.first());
/**
* Adds crop types to the map.
*
* @param {string} fuel A fuel type
*/
function addLayer(fuel) {
print(fuel);
Map.addLayer(pp.filter(ee.Filter.eq('crop', fuel)).style({styleProperty: 'styleProperty', neighborhood: 50}), {}, fuel, true, 0.65);
}
// Apply `addLayer` to each record in `fuels`
cropColor.keys().getInfo().map(addLayer);Property Mapping¶
| Property | GEE property |
|---|---|
| Author | author |
| Journal | journal |
| Year | year |
| Site country | site_country |
| Location | location |
| Latitude | latitude |
| Longitude | longitude |
| Soil information recorded in the paper | soil_from_paper |
| pH (surface layer) | pH_surface_layer |
| Replications in experiment | replications_exp |
| Crop | crop |
| Initial year of NT practice ( or first year of experiment if missing) | init_yr_nt |
| Sowing year | sowing_year |
| Harvest year | harvest_year |
| Years since NT started (yrs) | yrs_from_nt |
| Crop growing season recorded in the paper | cgsp |
| Crop rotation with at least 3 crops involved in CT | crit |
| Crop rotation with at least 3 crops involved in NT | crint |
| Crop sequence (details) | c_seq |
| Cover crop before sowing | cc_bf_sowing |
| Soil cover in CT | soil_cover_ct |
| Soil cover in NT | soil_cover_nt |
| Residue management of previous crop in CT (details) | rm_ct |
| Residue management of previous crop in NT (details) | rm_nt |
| Weed and pest control CT | wp_ct |
| Weed and pest control NT | wp_nt |
| Weed and pest control CT (details) | wpc_ct |
| Weed and pest control NT (details) | wpc_nt |
| Fertilization CT | ft_ct |
| Fertilization NT | ft_nt |
| N input | n_inp |
| N input rates with the unit kg N ha-1 (details) | n_inp_unit |
| Field fertilization (details) | fft |
| Irrigation CT | i_ct |
| Irrigation NT | i_nt |
| Water applied in CT | w_ct |
| Water applied in NT | w_nt |
| Other information | other |
| Yield of CT | yield_ct |
| Yield of NT | yield_nt |
| Relative yield change | rel_yl_chg |
| Yield increase with NT | yl_inc_nt |
| Outlier of CT | outlier_ct |
| Outlier of NT | outlier_nt |
| Sowing month | sw_month |
| Harvesting month | hv_month |
| P | P |
| E | E |
| PB | PB |
| Tave | Tave |
| Tmax | Tmax |
| Tmin | Tmin |
| ST | ST |
License¶
This work is licensed under the Creative Commons Attribution 4.0 International License (Creative Commons — Attribution 4.0 International — CC BY 4.0). Users are free to use, copy, distribute, transmit, and adapt the work for commercial and non-commercial purposes, without restriction, as long as clear attribution of the source is provided.
Created by: Yang Su et al.
Curated by: Samapriya Roy
Keywords: Conservation agriculture, Conventional tillage, crop yield, No tillage, No-till
Last updated: 2021-08-30