Soil volumetric water content calculated from neutron hydroprobe data at 15 NPP study locations at the Jornada Basin LTER site, 1989-ongoing

This data package contains soil water content data calculated from
monthly neutron hydroprobe count measurements made at 15 net primary
production (NPP) study locations on Jornada Experimental Range (JER)
and Chihuahuan Desert Rangeland Research Center (CDRRC) lands. Once
a month, neutron probe measurements are made at 10 depths (where
possible) at each of 10 access tubes at each of the 15 NPP sites
using a neutron probe (CPN Model 503DR Hydroprobe and CPN Model 503
Elite Hydroprobe). The raw dataset, also on EDI
(knb-lter-jrn.210013001), consists of the count of thermalized
neutrons at 30 cm depth intervals to a maximum depth of 300 cm. In
this data package, the raw neutron counts have been adjusted for
radioactive decay of the neutron source, then converted to
volumetric water content (VWC) to a maximum depth of 270 cm using
calibration equations (deepest probe depths are excluded from VWC
calculations). The NPP sites these measurements are made at
represent the 5 dominant vegetation types of the Jornada Basin,
which consist of 3 shrub (creosotebush, mesquite dune, and tarbush)
and 2 grass (upland grassland and playa) types. Three NPP sites are
located in each of the types. This data collection is ongoing with
new data collected monthly (updates to the EDI package may occur
less frequently).

NOTE: This version of the dataset includes calibrated data
from a new hydroprobe unit that has recently been put into service.
Repair parts were no longer available for the older unit.

本数据包包含从15个净初级生产力（Net Primary Production, NPP）研究点位的月度中子水文探针计数测量结果计算得到的土壤含水量数据，这些点位分布于霍纳达实验牧场（Jornada Experimental Range, JER）与奇瓦瓦沙漠牧场研究中心（Chihuahuan Desert Rangeland Research Center, CDRRC）所辖土地范围内。研究人员每月使用中子探针（CPN 503DR型水文探针与CPN 503 Elite型水文探针），在15个NPP站点的每根接入管的10个预设深度（条件允许时）开展测量，每个站点共布设10根接入管。该数据集的原始版本同样发布于环境数据倡议（Environmental Data Initiative, EDI）平台（存档编号：knb-lter-jrn.210013001），其内容为以30厘米为深度间隔的热中子计数数据，最大测量深度可达300厘米。在本数据包中，原始中子计数已针对中子源的放射性衰变完成校正，随后通过校准方程转换为体积含水量（Volumetric Water Content, VWC），最终计算深度上限为270厘米（最深处的探针测量数据未纳入体积含水量计算流程）。本次测量涉及的15个NPP站点覆盖了霍纳达盆地的5种优势植被类型，包括3种灌丛类型（石炭酸灌木（creosotebush）、沙丘牧豆灌丛与垂花灌丛（tarbush））以及2种草本类型（高地草原与干盐湖草原），每种植被类型均下设3个NPP站点。本数据集的采集工作仍在持续进行，每月均会收集新的观测数据（不过EDI平台的数据包更新频率相对较低）。

注意：本版本数据集包含了近期投入使用的新型水文探针设备的校准后数据，旧款探针设备已无法获取维修配件。